Display device with touch detecting function and electronic apparatus

• US 10,120,521 B2
• Filed: 08/23/2017
• Issued: 11/06/2018
• Est. Priority Date: 11/22/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Katsuta, Tadayoshi
• Primary Examiner(s): Cerullo, Liliana
• Application Number:
  US15/684,542
• Publication Number:
  US 20170351361A1
• Time in Patent Office: 440 Days
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• 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 3/0443 using a single layer of sensing electrodes

Abstract

A display device with a touch detecting function includes wiring for touch arranged in a peripheral area positioned on the outside of a display area, and a selection switch that selects one of drive electrodes to be coupled to the wiring for touch. A drive electrode scanning unit selects one of drive electrodes and includes a plurality of transfer circuits in the peripheral area. Part of the transfer circuits is a transfer circuit that performs output to the selection switch.

Claims

1. A display device comprising:

a substrate;

a first electrode disposed on the substrate;

a second electrode disposed on the substrate and arranged next to the first electrode;

a first wiring supplying a signal for a touch detecting function;

a first selection switch connected between the first electrode and the first wiring, and a second selection switch connected between the second electrode and the first wiring; and

a drive electrode scanning unit which controls the first and second selection switches,

wherein the drive electrode scanning unit includes a first shift register which controls the first selection switch, a second shift register which controls the second selection switch, and a third shift register connected to the first shift register and second shift register,

wherein an output of the first shift register is supplied to the third shift register, and an output of the third shift register is supplied to the second shift register, and

wherein the first, second, and third shift registers are arranged side by side in a direction in which the first wiring extends.

2. The display device according to claim 1, wherein a control signal is supplied to the first, second, and third shift registers.

3. The display device according to claim 1, further comprising a plurality of scanning signal lines in a display area, and a transfer circuit configured to control the plurality of scanning signal lines,

wherein the transfer circuit is arranged in a peripheral area positioned outside the display area, and the first, second, and third shift registers are arranged between the transfer circuit and the display area.

4. The display device according to claim 1, further comprising a control device configured to supply a drive voltage for display and the signal to the first wiring in different time periods.

5. The display device according to claim 1 , wherein the third shift register outputs an idle transfer signal to the second shift register.

6. The display device according to claim 1, wherein the signal is an alternating signal having a predetermined frequency.

7. The display device according to claim 6, wherein the predetermined frequency is in a range of several KHz to several hundred KHz.