Sensor-equipped display device

• US 9,671,887 B2
• Filed: 06/12/2015
• Issued: 06/06/2017
• Est. Priority Date: 06/13/2014
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Furutani, Naosuke
• Primary Examiner(s): Sasinowski, Andre
• Assistant Examiner(s): OLIVER, GERALD L
• Application Number:
  US14/737,951
• Publication Number:
  US 20150363016A1
• Time in Patent Office: 725 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: G09G 2300/023 Display panel composed of stacked panels
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

According to one embodiment, a sensor-equipped display device includes a display panel, a first driver, and a second driver. The display panel includes a first electrode, a second electrode and a detection electrode. The first driver delivers a common driving signal to the first electrode and the second electrode at a time of display driving, and selectively writes a write signal to one of the first electrode and the second electrode at a time of sensing driving. The second driver reads, from the detection electrode, a read signal indicative of a variation of a sensor signal occurring between the one of the first electrode and the second electrode, on one hand, and the detection electrode, on the other hand, at the time of the sensing driving.

Claims

1. A sensor-equipped display device comprising:

a display panel comprising a first electrode, a second electrode spaced apart from the first electrode and extending in parallel to the first electrode, and a detection electrode;

a first driver configured to deliver a common driving signal to the first electrode and the second electrode at a time of display driving for displaying an image, and to selectively write a write signal to one of the first electrode or the second electrode at a time of sensing driving for executing sensing;

a second driver configured to read, from the detection electrode, a read signal indicative of a variation of a sensor signal occurring between the one of the first electrode or the second electrode, on one hand, and the detection electrode, on the other hand, at the time of the sensing driving; and

a third driver,

wherein the display panel further comprises a lead line connected to the first driver, a first switching element connecting the lead line with the first electrode, and a second switching element connecting the lead line with the second electrode, and

the third driver is configured to change over the first switching element and the second switching element to a conductive state at the time of the display driving, and to selectively change over one of the first switching element or the second switching element to a conductive state and an opposing one of the first switching element or the second switching element to a non-conductive state at the time of the sensing driving.

2. The sensor-equipped display device of claim 1, wherein the first driver is configured to write the write signal to only the one of the first electrode or the second electrode at each time of the sensing driving.

3. The sensor-equipped display device of claim 2, wherein the first driver is configured to fix a potential of another of the first electrode or the second electrode than that of the first electrode or the second electrode to which the write signal is written at the time of the sensing driving.

4. The sensor-equipped display device of claim 1, wherein the first driver is configured to write the write signal to the first electrode in a first frame period, and to write the write signal to the second electrode in a second frame period following the first frame period.

5. The sensor-equipped display device of claim 1, wherein each of sensing periods, in which the sensing is executed, includes a first period and a second period, and

the first driver is configured to write the write signal to the first electrode in the first period, and to write the write signal to the second electrode in the second period.

6. The sensor-equipped display device of claim 1, wherein an area of the first electrode and an area of the second electrode are substantially equal.

7. The sensor-equipped display device of claim 1, wherein the first electrode and the second electrode extend in a first direction, and

the detection electrode extends in a second direction crossing the first direction.