DISPLAY APPARATUS

• US 20160349921A1
• Filed: 05/05/2016
• Published: 12/01/2016
• Est. Priority Date: 05/29/2015
• Status: Active Grant

• Current Assignee: Wacom Co Limited (Wacom)
• Original Assignee: Japan Display Incorporated
• Inventors: MIZUHASHI, Hiroshi, KURASAWA, Hayato, SUZUKI, Daichi, GOTOH, Fumitaka
• Granted Patent: US 10,139,927 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/046 by electromagnetic means

Abstract

A display apparatus with a touch detection function capable of improving accuracy is provided. The display apparatus includes: a pixel array having a plurality of pixels arranged in a matrix form; and a plurality of signal wires arranged in the pixel array. Here, when an externally-detecting object is detected, a plurality of coils having areas overlapping with each other are formed of a plurality of signal wires (drive electrodes) among the plurality of signal wires, and a magnetic field generated in the plurality of respective coils are superimposed in an overlapped area by supplying a drive signal to the plurality of coils.

Claims

1. A display apparatus comprising:

a pixel array having a plurality of pixels arranged in a matrix form; and

a plurality of signal wires arranged in the pixel array,

wherein, when an externally-detecting object is detected, a plurality of coils having areas overlapping with each other are formed of a plurality of signal wires among the plurality of signal wires, and

a driving signal is supplied to the plurality of coils, so that magnetic fields generated in the plurality of respective coils are superimposed in the overlapped area.

2. The display apparatus according to claim 1, further comprising:

a plurality of signal lines arranged in each column of the pixel array to supply an image signal to a plurality of pixels arranged in a corresponding column; and

a plurality of drive electrodes arranged in parallel with each other in the pixel array to supply a drive signal to the plurality of pixels in an image display,

wherein the plurality of signal wires are the plurality of drive electrodes.

3. The display apparatus according to claim 2,

wherein each of the plurality of drive electrodes includes a first electrode and a plurality of second electrodes connected to the first electrode and having a smaller resistance value than a resistance value of the first electrode.

4. The display apparatus according to claim 3, further comprising:

an electrode drive circuit that is connected to the plurality of drive electrodes, that has a plurality of drive electrodes arranged close to each other as winding wires of different coils among the plurality of coils to supply a drive signal when an externally-detecting object is detected.

5. The display apparatus according to claim 2,

wherein the plurality of drive electrodes include a first drive electrode arranged between a pair of sides of the pixel array parallel to a row of the pixel array and a second drive electrode arranged along a side of the pixel array, and

a width of the second drive electrode is made narrower than a width of the first drive electrode.

6. The display apparatus according to claim 3, further comprising:

a switching circuit that is connected to the plurality of signal lines and that forms a plurality of detection coils having the plurality of signal lines as winding wires when the externally-detecting object is detected,

wherein a magnetic field from the externally-detecting object is detected by the detection coils.

7. The display apparatus according to claim 6,

wherein the switching circuit includes a first switching circuit arranged along one side of a pair of sides parallel to a row of the pixel array and connected to the plurality of signal lines and a second switching circuit arranged along the other side and connected to the plurality of signal lines, and,

when the externally-detecting object is detected, the first switching circuit electrically connects signal lines so as to form the plurality of detection coils, and the second switching circuit outputs a detection signal in accordance with a magnetic field from the externally-detecting object.

8. The display apparatus according to claim 6, further comprising:

a signal line for magnetic field arranged along a side of the pixel array parallel to a column of the pixel array and having a width narrower than a width of the plurality of signal lines,

wherein the switching circuit forms a detection coil having the signal line for magnetic field as a winding wire.

9. The display apparatus according to claim 4,

wherein each of the plurality of drive electrodes is arranged along a row of the pixel array, and

the electrode drive circuit supplies a drive signal to a plurality of drive electrodes arranged on one side of a pair of sides of the pixel array parallel to the row of the pixel array, and then, supplies a drive signal to a plurality of drive electrodes arranged on the other side for the number of the drive electrodes corresponding to the overlapped area.

10. The display apparatus according to claim 4,

wherein each of the plurality of drive electrodes is arranged along a row of the pixel array, and

a total of widths of the drive electrodes arranged close to each other and a width of the overlapped area are substantially the same as each other.

11. The display apparatus according to claim 4,

wherein the electrode drive circuit includes:

a switching circuit arranged along one side of a pair of sides of the pixel array parallel to a column of the pixel array and connected to the plurality of drive electrodes; and

a selection drive circuit arranged along the other side of the pair of sides and connected to the plurality of drive electrodes, and

when the externally-detecting object is detected, the switching circuit electrically connects drive electrodes to be a winding wire of the plurality of coils, among the plurality of drive electrodes, and the selection drive circuit supplies a drive signal to the drive electrodes to be a winding wire of the plurality of coils among the plurality of drive electrodes.

12. The display apparatus according to claim 1,

wherein drive signals changing in synchronization with each other are supplied to the plurality of coils substantially at the same time.