INPUT DEVICE AND DISPLAY DEVICE

• US 20150116266A1
• Filed: 10/29/2014
• Published: 04/30/2015
• Est. Priority Date: 10/29/2013
• Status: Abandoned Application

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: INOUE, Manabu, KADO, Hiroyuki, KASAHARA, Shigeo, KOSUGI, Naoki, AOYAMA, Toshiyuki, INOUE, Shuji, TAKAGI, Kazushige, TOKAI, Akira, NAKAYAMA, Takahito
• Application Number:
  US14/527,605
• Publication Number:
  US 20150116266A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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 3/0445 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

An input device that can prevent a reduction in the accuracy of detection of a contact position, even when a display device operates in a PSR mode, is provided. The input device is provided in a display device configured to operate in either a first mode or a second mode and is configured to detect a contact position of a user. The input device includes a plurality of driving electrodes and a touch controller. The touch controller is configured to determine the operation mode of the display device, configured to generate touch driving signal based on a result of the determination, and configured to apply the generated touch driving signals to the driving electrodes.

Claims

1. An input device provided in a display device and configured to detect a contact position of a user, the display device being configured to operate in any of a plurality of operation modes including a first mode in which the display device operates at a first frame frequency and a second mode in which the display device operates at a second frame frequency lower than the first frame frequency, the input device comprising:

a plurality of driving electrodes;

a plurality of detection electrodes arranged to intersect the driving electrodes; and

a touch controller connected to the detection electrodes, the touch controller being configured to detect a detection signal from the detection electrodes so as to detect the contact position, configured to determine the operation mode of the display device, configured to generate touch driving signals based on a result of the determination, and configured to apply the generated touch driving signals to the driving electrodes.

2. The input device according to claim 1, wherein

the display device is configured to operate with a V-blank period in which no scanning signal is applied to scanning signal lines, the V-blank period being provided in one frame period, and

the touch controller is configured to determine the operation mode of the display device based on a length of the V-blank period.

3. The input device according to claim 1, wherein the touch controller is configured to determine the operation mode of the display device based on a length of one horizontal scanning period.

4. The input device according to claim 1, wherein the touch controller is configured to determine the operation mode of the display device based on a time interval between scanning signals applied to two adjacent scanning signal lines.

5. The input device according to claim 1, wherein

the display device is configured so that scanning signals are generated based on first timing signal generated depending on the operation mode and a second timing signal generated once per one frame, and configured so that when the display device operates in the second mode, the first timing signal is not generated in a V-blank period, and

the touch controller is configured to generate the touch driving signals based on the first timing signal when the display device operates in the first mode, and configured to generate the touch driving signals based on the first timing signal and also in the V-blank period in which the first timing signal is not generated when the display device operates in the second mode.

6. The input device according to claim 5, wherein

the display device is configured to operate with an H-blank period in which no scanning signal is applied to scanning signal lines, the H-blank period being provided in one horizontal scanning line, and

the touch controller is configured to generate the touch driving signals only in the H-blank period when the display device operates in the first mode, and configured to generate the touch driving signals in the H-blank period and the V-blank period when the display device operates in the second mode.

7. The input device according to claim 1, wherein the touch controller is configured to generate the touch driving signals only in a V-blank period and configured to generate more touch driving signals during the V-blank period when the display device operates in the second mode than during the V-blank period when the display device operates in the first mode.

8. The input device according to claim 1, wherein

the display device is configured to operate with blank periods each provided when scanning signals are applied to a predetermined number of scanning signal lines, and

the touch controller is configured to generate the touch driving signals only in the blank period when the display device operates in the first mode, and configured to generate the touch driving signals in the blank period and a V-blank period when the display device operates in the second mode.

9. The input device according to claim 1, wherein the touch controller is configured to generate more touch driving signals during one horizontal scanning period when the display device operates in the second mode than during one horizontal scanning period when the display device operates in the first mode.

10. The input device according to claim 9, wherein the touch controller is configured to generate the touch driving signals only in an H-blank period both when the display device operates in the first mode and when the display device operates in the second mode.

11. The input device according to claim 1, wherein the touch controller is configured to generate the touch driving signals only in a V-blank period when the display device operates in the first mode, and configured to generate the touch driving signals in an H-blank period and the V-blank period when the display device operates in the second mode.

12. The input device according to claim 1, wherein

the display device is configured to operate with blank periods each provided when scanning signals are applied to a predetermined number of scanning signal lines, and

the touch controller is configured to generate the touch driving signals only in the blank period when the display device operates in the first mode, and configured to generate the touch driving signals in the blank period and an H-blank period when the display device operates in the second mode.

13. The input device according to claim 1, wherein

the display device is configured so as to apply scanning signals non-sequentially to scanning signal lines in the second mode, and

the touch controller is configured to generate more touch driving signals during one horizontal scanning period when the display device operates in the second mode than during one horizontal scanning period when the display device operates in the first mode.

14. The input device according to claim 13, wherein the touch controller is configured to generate the touch driving signals only in an H-blank period both when the display device operates in the first mode and when the display device operates in the second mode.

15. The input device according to claim 1, wherein

the display device is configured to operate so as to apply scanning signals non-sequentially to scanning signal lines in the second mode in which a number of V-blank periods generated in one frame is larger than a number of V-blank periods generated in one frame when the display device operates in the first mode, and

the touch controller is configured to generate the touch driving signals only in the V-blank period both when the display device operates in the first mode and when the display device operates in the second mode.

16. The input device according to claim 1, wherein

the display device is configured to operate so as to apply scanning signals non-sequentially to scanning signal lines in the second mode and configured to operate with blank periods each provided when scanning signals are applied to a predetermined number of scanning signal lines both in the first mode and the second mode so that a number of the blank periods generated in one frame period when the display device operates in the second mode is larger than a number of the blank periods generated in one frame period when the display device operates in the first mode, and

the touch controller is configured to generate the touch driving signals only in the blank period both when the display device operates in the first mode and when the display device operates in the second mode.

17. A display device that is configured to operate in any of a plurality of operation modes including a first mode in which the display device operates at a first frame frequency and a second mode in which the display device operates at a second frame frequency lower than the first frame frequency, the display device comprising:

a plurality of scanning signal lines; and

an input device configured to detect a contact position of a user, the input device including

a plurality of driving electrodes,

a plurality of detection electrodes arranged to intersect the driving electrodes, and

a touch controller connected to the detection electrodes, the touch controller being configured to detect a detection signal from the detection electrodes so as to detect the contact position, configured to determine the operation mode of the display device, configured to generate touch driving signals based on a result of the determination, and configured to apply the generated touch driving signals to the driving electrodes.