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

• US 10,042,482 B2
• Filed: 05/22/2012
• Issued: 08/07/2018
• 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): FARAGALLA, MICHAEL A
• Application Number:
  US13/477,176
• Publication Number:
  US 20120229421A1
• Time in Patent Office: 2,268 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 touch display driver integrated chip (TDDI) comprising:

a display driving unit comprising;

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

a timing controller configured to control the source driver; and

a touch controller configured to detect an electrical change of sensing units of the display panel and to periodically check whether touching is made when the display driving unit enters a low-power consumption mode,

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

wherein the TDDI is configured to receive timing control information from a host controller.

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

3. The TDDI of claim 2, wherein the timing controller is configured to generate timing information and to transmit the timing information to the touch controller.

4. The TDDI of claim 2, wherein the display driving unit includes a power generator configured to generate a power voltage and to supply the power voltage to the touch controller.

5. The TDDI of claim 3, wherein the display driving unit is configured to generate the timing information based on the timing control information.

6. The TDDI of claim 5, wherein the touch controller is configured to generate a control signal in synchronization with the timing information and to control a timing of generating touch data using the control signal.

7. A touch display driver integrated chip (TDDI) comprising:

a display driving unit comprising

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

a timing controller configured to control the source driver; and

a touch controller configured to detect an electrical change of sensing units of the display panel and to periodically check whether touching is made when the display driving unit enters a low-power consumption mode,

wherein an operation of the display driving unit and an operation of the touch controller are synchronized with each other, the timing controller is configured to generate timing information and to transmit the timing information to the touch controller, and the display driving unit is configured to receive an external signal from an external controller and to generate the timing information based on the external signal, and

wherein the timing controller does not provide the timing information to the touch controller when the touch controller enters a sleep mode.

8. The TDDI of claim 7, wherein the display driving unit does not provide a power voltage to the touch controller when the touch controller enters the sleep mode.

9. A touch display driver integrated chip comprising:

a timing controller configured to control a timing of displaying an image to be displayed on a display panel; and

a touch controller configured to detect an electrical change of sensing units of the display panel based on timing information received from the timing controller,

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

wherein the timing controller does not provide the timing information to the touch controller when the touch controller enters a sleep mode.

10. The touch display driver integrated chip of claim 9, wherein the timing controller is configured to receive an external signal from an external controller and to generate the timing information based on the external signal.

11. The touch display driver integrated chip of claim 10, wherein the touch controller is configured to generate a control signal in synchronization with the timing information and to control a timing of generating touch data using the control signal.

12. The touch display driver integrated chip of claim 10, wherein the timing controller is configured to receive a sleep status signal from the touch controller.