Display apparatus and touch detection apparatus using shift of detection operation for reduced detection time

• US 9,298,294 B2
• Filed: 05/07/2010
• Issued: 03/29/2016
• Est. Priority Date: 05/19/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Takeuchi, Takeya, Noguchi, Kouji, Ishizaki, Koji, Teranishi, Yasuyuki, Nakanishi, Takayuki
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): LEE, DAVID J
• Application Number:
  US12/776,233
• Publication Number:
  US 20100295804A1
• Time in Patent Office: 2,153 Days
• Field of Search: 345/173
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 2203/04101 2.5D-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 and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• 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 3/0445 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 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 3/3614 Control of polarity reversal in general
• CPC Class Codes: G09G 3/3655 Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
• CPC Class Codes: G09G 3/3677 suitable for active matrices only

Abstract

A display apparatus includes: a display face; a display function layer adapted to vary display on the display face in response to an inputted image signal; a plurality of driving electrodes disposed separately in one direction; a detection scanning control section configured to apply a detection driving voltage to some of the plural driving electrodes and carry out detection driving scanning while shifting an application object of the detection driving voltage in the one direction on the display face and then control the detection driving scanning such that jump shift of carrying out shift with a pitch of twice or more times a driving electrode pitch is included; and a plurality of sensor lines disposed separately in a direction different from the one direction and responding to touch or proximity of a detection object with or to the display face to exhibit an electric variation.

Claims

1. A display apparatus, comprising:

a display face;

a display function layer adapted to display image data on said display face in response to an input image signal;

a plurality of driving electrodes disposed separately in one direction;

a detection scanning control section configured to apply a detection driving voltage simultaneously to some of the plurality of driving electrodes and carry out detection driving scanning while shifting application of the detection driving voltage in the one direction and control the detection driving scanning such that jump shifts are performed at a pitch of two times or more of an arrangement pitch of the driving electrodes;

a plurality of sensor lines disposed separately in a direction different from the one direction and responding to touch or proximity of a detection object with or to said display face to exhibit an electric variation, wherein

the plurality of driving electrodes are divided into a plurality of groups that are arranged in the one direction,

each of the plurality of groups are divided into a plurality of small groups,

said detection scanning control section applies the detection driving voltage respectively to each small group,

in the jump shifts, said detection scanning control section applies the detection driving voltage to the plurality of groups alternately such that the detection driving voltage is not continuously applied to at least two small groups that are adjacent to each other at a same time, and

a shift amount between successive jump shifts performed by said detection scanning control section is a predetermined fixed pitch interval; and

further wherein a region defined by each small group includes a plurality of sensor lines and a plurality of driving electrodes so that detection scanning is completed in a fraction of time required for display scanning.

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

a display scanning control section configured to control display driving scanning, wherein

said detection scanning control section carries out, within a period of the display driving scanning for N screens by said display scanning control section, the detection driving scanning for N+1 pictures or more.

3. The display apparatus according to claim 2, further comprising

a plurality of separated pixel electrodes and adapted to apply a display voltage to said display function layer for each pixel when the image signal is supplied, wherein

the plurality of driving electrodes function also as a plurality of display driving electrodes which are disposed in a pitch equal to a natural number of times a pixel pitch defined by said display function layer and to which a display driving voltage for applying a reference to the display voltage upon display variation by said display function layer successively in the one direction from said display scanning control section.

4. The display apparatus according to claim 3, wherein

said detection scanning control section carries out application of the detection driving voltage at the same time to m ones of said driving electrodes, m being equal to or greater than two.

5. The display apparatus according to claim 4, wherein:

the plurality of sensor lines are disposed on the display face side of said display function layer;

the plurality of driving electrodes are disposed on the side opposite to that of said display face of said display function layer; and

the plurality of pixel electrodes are disposed between said display function layer and the plurality of driving electrodes.

6. The display apparatus according to claim 5, wherein

said display function layer is a liquid crystal layer.

7. The display apparatus according to claim 6, wherein

said detection scanning control section functions also as said display scanning control section configured to supply and control the display driving voltage.

8. The display apparatus according to claim 1, wherein

said detection scanning control section carries out application of the detection driving voltage at the same time to m ones of said driving electrodes, m being equal to or greater than two.

9. The display apparatus according to claim 1, wherein

the plurality of sensor lines are disposed on the display face side of said display function layer;

the plurality of driving electrodes are disposed on the side opposite to that of said display face of said display function layer, and

a plurality of pixel electrodes corresponding to each pixel and apply a display voltage for which a potential of a corresponding driving electrode is used as a reference to said display function layer for each pixel when the image signal is supplied are disposed between said display function layer and the plurality of driving electrodes.

10. The display apparatus according to claim 1, wherein

said display function layer is a liquid crystal layer.

11. The display apparatus according to claim 1, wherein

said detection scanning control section controls the detection driving scanning such that the application object of the detection driving voltage is changed in order in the one direction among the plurality of driving electrodes disposed separately in the one direction.

12. The display apparatus according to claim 1, wherein,

where a period from a current shift to a next shift is determined as one cycle, said detection scanning control section periodically executes and controls driving halting of one or more cycles in which application of the detection driving voltage is not carried out.

13. The display apparatus according to claim 12, further comprising

a touch detection section configured to generate a detection signal from the electrical variation appearing on said sensor lines, wherein

said touch detection section includes a noise removing section configured to detect, within a period of the driving halting, a noise level from the potential level of said sensor lines on which the electrical variation from which the detection signal is generated is not superposed and carrying out noise removal.

14. The display apparatus according to claim 1, wherein,

where the shift operation is carried out by P times the driving electrode pitch, P being equal to or greater than 1, said detection scanning control section randomly controls the value of P.

15. The display apparatus according to claim 1, wherein

each of said sensor lines is coupled to each of said driving electrodes through a capacitance, and

a peak value of a potential variation which appears, when the detection driving voltage is applied to any of said driving electrodes, with one of the sensor lines which corresponds to the driving electrode differs between one or more ones of said sensor lines which correspond to contact or proximity of the detection object and the other sensor lines.

16. The display apparatus according to claim 1, wherein the detection driving scanning by said detection scanning control section and the display driving scanning by said display scanning control section are carried out in synchronism with each other for the plurality of driving electrodes.

17. A touch detection apparatus, comprising:

a detection face;

a plurality of driving electrodes disposed separately in one direction;

a detection scanning control section configured to apply a detection driving voltage simultaneously to some of the plurality of driving electrodes and carry out detection driving scanning while shifting application of the detection driving voltage in the one direction and control the detection driving scanning such that jump shifts are performed at a pitch of two times or more of an arrangement pitch of the driving electrodes; and

a plurality of sensor lines disposed separately in a direction different from the one direction and adapted to exhibit, if a detection object is brought into touch with or proximity to said detection face while the detection driving scanning is being carried out by said detection scanning control section, electric variation in response to the touch or the proximity, wherein

the plurality of driving electrodes are divided into a plurality of groups that are arranged in the one direction,

each of the plurality of groups are divided into a plurality of small groups,

said detection scanning control section applies the detection driving voltage respectively to each small group,

in the jump shifts, said detection scanning control section applies the detection driving voltage to the plurality of groups alternately such that the detection driving voltage is not continuously applied to at least two small groups that are adjacent to each other at a same time, and

a shift amount between successive jump shifts performed by said detection scanning control section is a predetermined fixed pitch interval; and

further wherein a region defined by each small group includes a plurality of sensor lines and a plurality of driving electrodes so that detection scanning is completed in a fraction of time required for display scanning.