Touch-display control device and personal data assistant

• US 10,242,640 B2
• Filed: 01/04/2014
• Issued: 03/26/2019
• Est. Priority Date: 01/28/2013
• Status: Active Grant

• Current Assignee: Synaptics Incorporated
• Original Assignee: Synaptics Japan GK (Synaptics Incorporated)
• Inventors: Ota, Shigeru, Azuma, Yuri, Suzuki, Takahiro
• Primary Examiner(s): Faragalla, Michael A
• Assistant Examiner(s): Bibbee, Chayce R
• Application Number:
  US14/147,512
• Publication Number:
  US 20140210775A1
• Time in Patent Office: 1,907 Days
• 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 3/044 by capacitive means
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04
• CPC Class Codes: G09G 5/395 Arrangements specially adapted for transferring the contents of the bit-mapped memory to the screen G09G5/399 takes precedence

Abstract

Provided are a touch display control device and an information terminal device, which are arranged so that the noise resulting from the actions for activation and display on a display panel, and the noise caused by the actions of activation and detection on a touch sensor never affects each other, and are useful for suppressing the elicitation of the difference in brightness attributed to non-display in a display frame.

The information terminal device includes: a display controller operable to change start timings of display and non-display periods in a cycle of a frame synchronizing signal of a display frame, in each cycle of the frame synchronizing signal or each sequence of cycles thereof; and a touch panel controller operable to perform the activation of a touch panel and a touch detection during the non-display period.

Claims

1. A touch display control device comprising:

a display controller operable to perform display control in synchronization with a frame synchronizing signal which defines each frame period, wherein each frame period comprises;

a first display period,

a first non-display period following the first display period, and

a second display period following the first display period,

wherein a start time of a second display period in a first frame period is different than a start time of a second display period in a second frame period following the first frame period; and

a touch panel controller operable to perform a touch detection,

wherein the display controller is operable to control start times of display and non-display periods in each frame period,

wherein the touch panel controller is further operable to perform the touch detection in first non-display period,

wherein a start time of the first display period begins when the display controller drives a display, and

wherein the start time of the first non-display period begins when the display controller stops driving the display.

2. The touch display control device according to claim 1, wherein the display controller includes three display periods and two non-display periods in a cycle of the frame synchronizing signal.

3. The touch display control device according to claim 1, wherein the display controller includes two display periods and one non-display period in a cycle of the frame synchronizing signal.

4. The touch display control device according to claim 1, wherein the display controller changes the start times of the display and non-display periods in units of cycles of the frame synchronizing signal so that the start times of the display and non-display periods complete a cycle in each sequence of cycles of the frame synchronizing signal.

5. The touch display control device according to claim 2, wherein the display controller changes the start times of the display and non-display periods in units of the cycles of the frame synchronizing signal so that the start times of the display and non-display periods complete a cycle in each sequence of cycles of the frame synchronizing signal.

6. The touch display control device according to claim 3, wherein the display controller changes the start times of the display and non-display periods in units of the cycles of the frame synchronizing signal so that start times of the display and non-display periods complete a cycle in each sequence of cycles of the frame synchronizing signal.

7. The touch display control device according to claim 2, wherein the display controller reads out data written in a buffer memory in units of display frames to perform display control, and adjourns the action of reading out data from the buffer memory in units of display frames during the first non-display period.

8. The touch display control device according to claim 3, wherein the display controller reads out data written in a buffer memory in units of display frames to perform display control, and adjourns the action of reading out data from the buffer memory in units of display frames during the first non-display period.

10. The touch display control device according to claim 3, wherein the display controller uses a buffer memory as a delay buffer for delaying display control of display data with the non-display period, and begins writing display data into the buffer memory from a first non-display period without writing display data into the buffer memory from a display period at a beginning of a display frame to the first non-display period, and reads out display data written in the buffer memory from an end of the first non-display period.

11. The touch display control device according to claim 4, wherein the display controller includes:

a frame counter operable to count display frames based on the frame synchronizing signal;

a line counter operable to count display lines based on a display-line-synchronizing signal in a display frame; and

a logic circuit operable to decide start times of display and non-display periods based on a result of a comparison between a count value of the line counter and an expected value thereof, and a count value of the frame counter, wherein the expected value of the count value of the line counter is changed according to the count value of the frame counter.

12. The touch display control device according to claim 5, wherein the display controller includes:

a frame counter operable to count display frames based on the frame synchronizing signal;

a line counter operable to count display lines based on a display-line-synchronizing signal in a display frame; and

a logic circuit operable to decide start times of display and non-display periods based on a comparison between a count value of the line counter and an expected value thereof, and a count value of the frame counter, wherein the expected value of the count value of the line counter is changed according to the count value of the frame counter.

13. The touch display control device according to claim 6, wherein the display controller includes:

a frame counter operable to count display frames based on the frame synchronizing signal;

a line counter operable to count display lines based on a display-line-synchronizing signal in a display frame; and

a logic circuit operable to decide start times of display and non-display periods based on a comparison between a count value of the line counter and an expected value thereof, and a count value of the frame counter, wherein the expected value of the count value of the line counter is changed according to the count value of the frame counter.

14. The touch display control device according to claim 12, wherein the logic circuit selects one group of expected value groups having expected values of the count value of the line counter according to the count value of the frame counter, and determines start-line and end-line positions of the non-display period with a count time of the line counter matching an expected value of the selected expected value group.

15. The touch display control device according to claim 13, wherein the logic circuit selects one group of expected value groups having expected values of the count value of the line counter according to the count value of the frame counter, and determines start-line and end-line positions of the non-display period with a count timing of the line counter matching an expected value of the selected expected value group.

16. The touch display control device according to claim 14, wherein the logic circuit selects one group of expected value groups having expected values of the count value of the line counter according to the count value of the frame counter, and determines start-line and end-line positions of the non-display period with a count timing of the line counter matching an expected value of the selected expected value group.

17. The touch display control device according to claim 14, wherein the display controller includes a mode register for selecting, from the expected value groups, a predetermined expected value group having mode data compared to the count value of the line counter that is rewritably set.

18. The touch display control device according to claim 15, wherein the controller further includes a mode register for selecting, from the expected value groups, a predetermined expected value group having mode data compared to the count value of the line counter is that rewritably set.

20. The touch display control device according to claim 1 formed as a semiconductor substrate.

9. A touch display control device comprising:

a display controller operable to perform display control in synchronization with a frame synchronizing signal of a display frame; and

a touch panel controller operable perform a touch detection,

wherein the display controller is operable to change start times of display and non-display periods in a cycle of the frame synchronizing signal, and

wherein the touch panel controller is further operable to perform the touch detection in a non-display period,

wherein a start time of a display period begins when the touch panel controller drives the display,

wherein a start time of the non-display period begins when the touch panel controller stops driving the display, and

wherein the display controller includes three display periods and two non-display periods in the cycle of the frame synchronizing signal, uses a buffer memory as a delay buffer for delaying display control of display data by the non-display period, and starts the action of writing display data into the buffer memory from a first non-display period without writing display data into the buffer memory from a display period at a beginning of a display frame to the first non-display period, starts reading out display data written in the buffer memory from an end of the first non-display period, suspends reading out from the buffer memory in line with the start of a subsequent display period, and resumes reading out from the buffer memory at an end of a subsequent non-display period.

19. A touch display control device comprising:

a display controller operable to perform display control in synchronization with a frame synchronizing signal of a display frame; and

a touch panel controller operable to perform a touch detection,

wherein the display controller is operable to change start times of display and non-display periods in a cycle of the frame synchronizing signal,

wherein the touch panel controller is further operable to perform the touch detection in a non-display period,

wherein a start time of a display period begins when the display controller drives the display,

wherein a start time of the non-display period begins when the display controller does stops driving the display, and

wherein the display controller further includes;

a frame counter operable to count display frames based on the frame synchronizing signal;

a line counter operable to count display lines based on a display-line-synchronizing signal in a display frame; and

a logic circuit operable-to decide start times of display and non-display periods based on a comparison between a count value of the line counter and an expected value thereof, and a count value of the frame counter, wherein the expected value of the count value of the line counter is changed according to the count value of the frame counter,

wherein the logic circuit selects one group of expected value groups having expected values of the count value of the line counter according to the count value of the frame counter, and determines start-line and end-line positions of the non-display period with a count timing of the line counter matching an expected value of the selected expected value group, and

wherein the display controller further includes a mode register for selecting, from the expected value groups, a predetermined expected value group to be compared to the count value of the line counter that is rewritably set.

21. An information device, comprising:

a touch panel enabling a touch detection;

a display controller operable to perform display control in synchronization with a frame synchronizing signal of a display frame; and

a touch panel controller operable to perform a touch detection,

wherein the display controller is capable of controlling times of display and non-display periods in each frame period, wherein each frame period comprises;

a first display period;

a first non-display period following the first display period, and

a second display period following the first display period,

wherein a duration of a first display period in a first frame period is different than a duration of a first display period in a second frame period following the first frame period, and

wherein the touch panel controller performs the touch detection in the first non-display period,

wherein a start time of the first display period begins when the display controller drives the display, and

wherein a start time of the first non-display period begins when the display controller stops driving the display.