DISPLAY DEVICE AND ELECTRONIC UNIT

• US 20150199051A1
• Filed: 01/27/2015
• Published: 07/16/2015
• Est. Priority Date: 05/21/2009
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Inventors: NOGUCHI, Kouji, NAKANISHI, Takayuki, ISHIZAKI, Koji, TAKEUCHI, Takeya, TERANISHI, Yasuyuki
• Application Number:
  US14/606,818
• Publication Number:
  US 20150199051A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 2201/121 common or background
• 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
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 5/18 Timing circuits for raster scan displays specially adapted for television H04N ; synchronisation between the display unit and other display units, videodisc player G09G5/12

Abstract

The display device with high detection accuracy includes: display pixel electrodes; a common electrode; a display function layer; a display control circuit performing image display control by applying a pixel voltage to each of the display pixel electrodes and applying a common drive voltage to the common electrode, the common drive voltage inverting in synchronization with a drive cycle of the image display control; a touch detection electrode cooperating with the common electrode to form a capacitor; and a touch detection circuit detecting an external proximity object, based on a detection signal obtained from the touch detection electrode in response to the common drive voltage applied to the common electrode. The touch detection circuit corrects the detection signal based on a gray scale of the image signal at the time of acquisition of the detection signal, and performs the detection operation.

Claims

1-20. -20. (canceled)

21. A display panel with a touch detection function, the display panel comprising:

a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal including a series of pulses appearing at the selected pulse period;

a display section performing display based on the synchronization signal; and

a touch detection section performing touch detection operation based on the synchronization signal.

22. The display panel according to claim 21,

wherein the display section performs display for one screen in a pulse duration in which the series of pulses continues.

23. The display panel according to claim 22,

wherein the touch detection section performs the touch detection operation in the pulse duration.

24. The display panel according to claim 23,

wherein the touch detection section performs the touch detection operation, also in a blanking period in the pulse duration.

25. The display panel according to claim 21,

wherein the pulse period is set by a clock count of a base clock, and

the signal generation section changes the pulse period by changing a clock frequency of the base clock.

26. The display panel according to claim 22,

wherein the pulse duration is included in a frame period based on an image signal supplied.

27. The display panel according to claim 21, further comprising:

a plurality of drive electrodes arranged side by side to extend in one direction;

a detection electrode arranged side by side to extend in a direction intersecting the drive electrode;

a plurality of pixel electrodes; and

a display element performing display based on a voltage of the drive electrode and a voltage of the pixel electrode,

wherein, based on the synchronization signal, the display section performs display by driving and thereby sequentially scanning a plurality of the display elements per a plurality of the display elements corresponding to each of the drive electrodes, and

at timing synchronized with the synchronization signal, the touch detection section sequentially applies a drive signal to the plurality of drive electrodes, and detects a touch event based on a detection signal outputted from the detection electrode.

28. The display panel according to claim 27,

wherein the plurality of drive electrodes form a plurality of drive electrode blocks each including a predetermined number of the drive electrodes, and

the touch detection section applies the drive signal to each of the drive electrode blocks, for each drive period including a predetermined number of the pulse periods.

29. A method of driving a display panel with a touch detection function, the method comprising:

selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal that includes a series of pulses appearing at the selected pulse period;

performing display for one screen, and performing touch detection operation, based on the series of pulses of the synchronization signal; and

switching display of a screen, for each predetermined frame period.

30. A drive circuit comprising:

a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal that includes a series of pulses appearing at the selected pulse period;

a display drive section driving a display panel based on the synchronization signal; and

a touch-detection drive section driving a touch panel based on the synchronization signal.

31. An electronic unit including a display panel with a touch detection function, and a control section performing operation control using the display panel, the display panel comprising:

a signal generation section selecting one pulse period from a plurality of pulse periods prepared beforehand, and generating a synchronization signal including a series of pulses appearing at the selected pulse period;

a display section performing display based on the synchronization signal; and

a touch detection section performing touch detection operation based on the synchronization signal.