Touch controller having increased sensing sensitivity, and display driving circuit and display device and system having the touch controller

• US 10,649,591 B2
• Filed: 09/15/2017
• Issued: 05/12/2020
• Est. Priority Date: 10/30/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Hyoung-rae, Choi, Yoon-kyung, Cho, Hwa-hyun, Kim, Sang-woo, Ahn, Hae-yong, Kwon, Hyung-dal, Park, Jong-kang, Byun, San-ho, Yu, Jae-suk
• Primary Examiner(s): Nguyen, Chanh D
• Assistant Examiner(s): Truong, Nguyen H
• Application Number:
  US15/706,194
• Publication Number:
  US 20180004326A1
• Time in Patent Office: 970 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/3215 Monitoring of peripheral devices
• CPC Class Codes: G06F 1/3237 by disabling clock generation or distribution
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/2007 Display of intermediate tones
• CPC Class Codes: G09G 3/2092 Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A touch controller includes a touch data generator that is connected to a plurality of sensing lines, the touch data generator sensing a change in capacitance of a sensing unit connected to each of the sensing lines and generating touch data by processing the sensing signal corresponding to the result of sensing; and a signal processor that controls a timing of generating the touch data by receiving at least one piece of timing information for driving a display panel from a timing controller, and then providing either the timing information or a signal generated from the timing information as a control signal to the touch data generator.

Claims

1. A printed circuit board (PCB) structure of a touch display driver integrated chip (TDDI) comprising:

a display driver configured to drive a source line of a display panel; and

a touch controller configured to detect an electrical change of sensing units on the display panel,

wherein the display driver and the touch controller are included in a same semiconductor chip,

wherein the TDDI is configured to receive a signal from a host controller via a connection terminal on a flexible printed circuit board,

wherein the TDDI comprises a first pad region including a plurality of first pads for receiving a voltage signal from the sensing units and a second pad region including a plurality of second pads for transmitting gray-scale data to the display panel, the first pad region being separated apart from the second pad region on the TDDI, and

wherein the display driver provides power to the touch controller when the display driver is in a low-power consumption mode and an operation for driving the source line of the display panel is kept deactivated, and the touch controller is configured to periodically check the electrical change of the sensing units by using the power from the display driver during the low-power consumption mode of the display driver.

2. The TDDI of claim 1, wherein an operation of the display driver and an operation of the touch controller are synchronized with each other.

3. The TDDI of claim 2, wherein the TDDI is configured to directly receive the voltage signal from the sensing units via a conductive line.

4. The TDDI of claim 2, wherein the display driver is configured to receive a first signal via a first path and the touch controller is configured to receive a second signal via a second path, and

wherein the first path is different from the second path.

5. The TDDI of claim 4, wherein the second path is an I2C interface.

6. The TDDI of claim 5, wherein the first path is an RGB interface.

7. The TDDI of claim 4, wherein the second path is a serial peripheral interface.

8. The TDDI of claim 2, wherein a region in which the touch controller is located is separated apart from a region in which the display driver is located.

9. The TDDI of claim 1, wherein the TDDI receives a vertical synchronization signal as the signal, and

the display driver and the touch controller are synchronized with each other based on the vertical synchronization signal received from the host controller.

10. A printed circuit board (PCB) structure of a touch display driver integrated chip (TDDI) comprising:

a display driver configured to drive a source line of a display panel; and

a touch controller configured to detect an electrical change of sensing units on the display panel,

wherein the display driver and the touch controller are included in a same semiconductor chip,

wherein the TDDI comprises a first pad region including a plurality of first pads for receiving a voltage signal from the sensing units and a second pad region including a plurality of second pads for transmitting gray-scale data to the display panel, the first pad region being separated apart from the second pad region on the TDDI, and

wherein the display driver provides power to the touch controller when the display driver is in a low-power consumption mode and an operation for driving the source line of the display panel is kept deactivated, and the touch controller is configured to periodically check the electrical change of the sensing units by using the power from the display driver during the low-power consumption mode of the display driver.

11. The TDDI of claim 10, wherein an operation of the display driver and an operation of the touch controller are synchronized with each other.

12. The TDDI of claim 11, wherein the TDDI is configured to directly receive the voltage signal from the sensing units via a conductive line.

13. The TDDI of claim 11, wherein the display driver is configured to receive a first signal via a first path and the touch controller is configured to receive a second signal via a second path, and

wherein the first path is different from the second path.

14. The TDDI of claim 13, wherein the second path is an I2C interface.

15. The TDDI of claim 14, wherein the first path is an RGB interface.

16. The TDDI of claim 13, wherein the second path is a serial peripheral interface.

17. The TDDI of claim 16, wherein the first path is an RGB interface.

18. The TDDI of claim 11, wherein a region in which the touch controller is located is separated apart from a region in which the display driver is located.