DISPLAY DEVICE AND DRIVING METHOD

• US 20100328274A1
• Filed: 06/03/2010
• Published: 12/30/2010
• Est. Priority Date: 06/30/2009
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: ISHIZAKI, Koji, TERANISHI, Yasuyuki, NAKANISHI, Takayuki, NOGUCHI, Kouji, TAKEUCHI, Takeya
• Granted Patent: US 8,947,371 B2
• Time in Patent Office: Days
• US Class Current: 345/204
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• 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 2310/02 Addressing, scanning or driving the display screen or processing steps related thereto
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes
• 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

Disclosed herein is a display device, including: a display surface; a display functional layer adapted to control the display of a screen viewed from outside the display surface; a drive control section operable to perform display scanning and driving adapted to scan and drive, in the one direction, the plurality of drive electrodes, and also operable to perform, a plurality of times and for M display screens, detection scanning and driving adapted to continuously scan and drive all or part of the plurality of drive electrodes within the period of time; and a plurality of sensor lines arranged in a direction other than the one direction to be separate from each other, which produce an electrical change if an object to be detected comes in contact with or proximity to the display surface while the drive control section performs the detection scanning and driving.

Claims

1. A display device, comprising:

a display surface;

a display functional layer adapted to control the display of a screen viewed from outside the display surface;

a drive control section operable to perform display scanning and driving adapted to scan and drive, in the one direction, the plurality of drive electrodes, and also operable to perform, a plurality of times and for M display screens, detection scanning and driving adapted to continuously scan and drive all or part of the plurality of drive electrodes within the period of time in which N display screens are displayed by the display scanning and driving, where N and M are arbitrary natural numbers which satisfy the condition N<

M; and

a plurality of sensor lines arranged in a direction other than the one direction to be separate from each other, which produce an electrical change if an object to be detected comes in contact with or proximity to the display surface while the drive control section performs the detection scanning and driving.

2. The display device of claim 1, wherein

when the drive electrode subjected to the detection scanning and driving approaches the drive electrode subjected to the display scanning and driving, the drive control section skips the detection scanning and driving of one or more predetermined number of the drive electrodes so as to jump over the drive electrode subjected to the display scanning and driving to resume the detection scanning and driving starting from the next drive electrode in the scanning direction or beyond.

3. The display device of claim 1, wherein

when the display scanning and driving is performed starting from the first one of the plurality of drive electrodes on one side to the last one on the other side, the drive control section begins its scan for the detection scanning and driving starting from the drive electrode next to the first one on one side, from where the display scanning and driving begins, in the scanning direction or beyond.

4. The display device of claim 1, wherein

when one cycle of the detection scanning and driving ends followed by next cycle thereof while the detection scanning and driving is performed a plurality of times during one screen display period, the drive control section determines, according to the position of the drive electrode subjected to the most recent display scanning and driving of all the plurality of drive electrodes, whether to begin the next cycle of detection scanning and driving starting from the drive electrode next to the one subjected to the most recent display scanning and driving in the scanning direction or beyond or starting from the first one on one side from where the display scanning and driving begins.

5. The display device of claim 4, wherein

if it is determined from the position of the drive electrode subjected to the most recent display scanning and driving that a first period which lasts from when the next cycle of detection scanning and driving begins from the drive electrode next to the one subjected to the most recent display scanning and driving to when the detection scanning and driving of the last drive electrode on the other side is terminated is shorter than a second period from when the next cycle of detection scanning and driving begins from the first drive electrode on one side from where the display scanning and driving begins to when the detection scanning and driving catches up with the display scanning and driving, the drive control section begins the next cycle of detection scanning and driving starting from the drive electrode next to the one subjected to the most recent display scanning and driving in the scanning direction or beyond, and

if the first period is determined to be longer than the second period, the drive control section begins the next cycle of detection scanning and driving starting from the first drive electrode on one side.

6. The display device of claim 1, wherein

the value M is twice the value N.

7. The display device of claim 1, wherein

the drive control section performs the detection scanning and driving with a discretely reduced number of drive electrodes scanned once for every two cycles of the display scanning and driving i.e. two display periods, with the display scanning and driving and detection scanning and driving set to the same drive frequency.

8. The display device of claim 7, wherein

the display scanning and driving is performed a plurality of times within one screen display period using interlaced scan.

9. The display device of claim 7, wherein

the drive control section performs each of the plurality of cycles of the display scanning and driving starting from the first one of the plurality of drive electrodes on one side to the last one on the other side,

the drive control section performs odd-numbered cycles of the plurality of cycles of the detection scanning and driving performed during one screen display period starting from the drive electrode next to the first one on one side, from where the display scanning and driving begins, in the scanning direction or beyond to the last one on the other side, and

the drive control section performs even-numbered cycles starting from the first drive electrode on one side to the drive electrode previous to the last one on the other side or beyond.

10. The display device of claim 1, wherein

the drive control section selects two or more predetermined number of drive electrodes from among the plurality thereof and simultaneously drives the selected drive electrodes for the detection scanning and driving to repeat the selection and simultaneous driving of the drive electrodes in the one direction.

11. The display device of claim 1, comprising:

a sensor section including a plurality of sensor lines and the plurality of drive electrodes, wherein

the sensor section is an electrostatic capacitance sensor section in which each of the plurality of sensor lines is coupled to one of the plurality of drive electrodes through electrostatic capacitance so that the electrostatic capacitance changes as a result of the approach of the object to be detected during driving by the drive control section.

12. The display device of claim 1, wherein

the display functional layer is a liquid crystal layer.

13. The display device of claim 12, comprising:

a circuit substrate on which a display control circuit is formed; and

an opposed substrate that is arranged to be opposed to the circuit substrate, wherein

the plurality of drive electrodes are formed on the circuit substrate, and a plurality of pixel electrodes are stacked above the plurality of drive electrodes with an insulating layer provided therebetween, and

the display functional layer, in which liquid crystal is driven in transverse electric field mode when a voltage is applied between the pixel electrodes and drive electrodes, is arranged between the plurality of pixel electrodes formed on the circuit substrate and the opposed substrate.

14. A display device driving method, comprising a step of:

driving of performing display scanning and driving adapted to scan and drive, in one direction, a plurality of drive electrodes arranged in the one direction to be separate from each other on a surface opposed to a display surface whose screen is viewed externally, and performing detection scanning and driving of the same plurality of drive electrodes for sensor detection adapted to detect the change in capacitive coupling as a result of the approach of an object to be detected from a plurality of sensor lines that are capacitively coupled to the plurality of drive electrodes, wherein

the driving step performs, a plurality of times and for M display screens, detection scanning and driving adapted to continuously scan and drive all or part of the plurality of drive electrodes within the period of time in which N display screens are displayed by the display scanning and driving where N and M are arbitrary natural numbers which satisfy the condition N<

M.