Touch detecting function display apparatus, driving circuit, driving method of touch detecting function display apparatus and electronic equipment

• US 9,779,678 B2
• Filed: 04/14/2015
• Issued: 10/03/2017
• Est. Priority Date: 08/23/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Mizuhashi, Hiroshi, Nakanishi, Takayuki
• Primary Examiner(s): DICKE, CHAD M
• Application Number:
  US14/686,238
• Publication Number:
  US 20150325191A1
• Time in Patent Office: 903 Days
• Field of Search: 345173-178, 178 1801- 2001
• 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 3/0445 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 2230/00 Details of flat display driving waveforms
• CPC Class Codes: G09G 2300/0434 Flat panel display in which a field is applied parallel to the display plane
• CPC Class Codes: G09G 2310/0286 Details of a shift registers arranged for use in a driving circuit
• 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 touch detecting function display apparatus includes a plurality of common driving electrodes, a display element performing display, a touch detection element detecting an external approaching object, and a scanning driving unit performing first scanning driving for sequentially applying a display driving signal to the plurality of common driving electrodes in a time division manner and second scanning driving for sequentially applying a touch detection driving signal to the plurality of common driving electrodes in a time division manner, wherein the scanning driving unit performs the second scanning driving at a scanning speed higher than that of the first scanning driving, and applies the display driving signal to an overlapping common driving electrode when the common driving electrode selected as a target of the first scanning driving overlaps with the common driving electrode selected as a target of the second scanning driving.

Claims

1. A touch detecting function display apparatus comprising:

a plurality of common driving electrodes that are disposed in parallel so as to extend in one direction;

a plurality of scanning signal lines;

a display element that performs display based on a pixel signal and a display driving signal;

a touch detection element that detects an external approaching object based on a touch detection driving signal;

a plurality of driving circuits configured to drive the plurality of scanning signal lines and the plurality of common driving electrodes;

a first scanning circuit configured to sequentially apply display scanning signals to the driving circuits in a time division manner; and

a second scanning circuit configured to sequentially apply touch detection signals to the plurality of driving circuits in a time division manner,

wherein the second scanning circuit is configured to perform a second scanning driving at a scanning speed higher than a scanning speed of a first scanning driving, the first scanning driving being driving the display element and the second scanning driving being driving the touch detection element,

wherein respective ones of the plurality of driving circuits include a display priority circuit configured to receive inputs consisting of a corresponding one of the plurality of display scanning signals and a corresponding one of the plurality of touch detection signals, and

wherein the display priority circuit is configured such that;

in a case where the display priority circuit receives only the corresponding one of the display scanning signals at a given time, the display priority circuit applies the display driving signal to a corresponding one of the common driving electrodes derived from the received display scanning signal,

in a case where the display priority circuit receives only the corresponding one of the touch detection signals at the given time, the display priority circuit applies the touch detection driving signal to the corresponding one of the common driving electrodes derived from the received touch detection signal, and

in a case where the display priority circuit receives both the corresponding one of the display scanning signals and the corresponding one of the touch detection signals at the given time, the display priority circuit applies the display driving signal to the corresponding one of the common driving electrodes derived from the received display scanning signal.

2. The touch detecting function display apparatus according to claim 1, wherein the second scanning circuit is configured to simultaneously select at least two of the common driving electrodes as targets of the second scanning driving by applying the touch detection signals to at least two of the driving circuits simultaneously.

3. The touch detecting function display apparatus according to claim 2, wherein the display driving signal is a rectangular wave signal,

wherein the second scanning driving is operated based on a basic operation clock having the same frequency as a basic operation clock of the first scanning driving, and

wherein the driving circuits are configured such that, during the second scanning driving, the selected common driving electrodes are shifted by two or more at timings corresponding to level transitions of the display driving signal.

4. The touch detecting function display apparatus according to claim 2,

wherein the second scanning driving circuit includes a shift register configured to perform the second scanning driving,

wherein the touch detecting function display apparatus further comprises a scanning control circuit configured to control the shift register,

wherein the shift register is configured to perform serial parallel conversion on a control signal that has a pulse width corresponding to at least two of the plurality of common driving electrodes and is supplied from the scanning control circuit, and

wherein signals obtained by performing the serial parallel conversion are used as the touch detection signals to select the at least two of the plurality of common driving electrodes which are the targets of the second scanning driving.

5. The touch detecting function display apparatus according to claim 4, wherein the serial parallel conversion is performed based on a clock signal which has two or more transitions during a period corresponding to a scanning pitch.

6. The touch detecting function display apparatus according to claim 5, wherein the second scanning circuit further includes a timing adjustment circuit configured to output each of parallel output signals generated through the serial parallel conversion at a timing corresponding to a start timing of the period corresponding to the scanning pitch.

7. The touch detecting function display apparatus according to claim 4,

wherein the second scanning circuit further includes a division circuit configured to divide each of parallel output signals generated through the serial parallel conversion into two or more signals, and

wherein the shift register is configured to perform the serial parallel conversion based on the clock signal, and the division circuit is configured to divide the parallel output signal, thereby selecting the at least two of the plurality of common driving electrodes which are targets of the second scanning driving.

8. The touch detecting function display apparatus according to claim 1, wherein the touch detection signals are rectangular wave signals having amplitude larger than amplitude of the display scanning signals.

9. A driving circuit comprising a plurality of driving sub-circuits configured to drive a plurality of scan signal lines and a plurality of common driving electrodes, a first scanning circuit configured to sequentially apply display scanning signals to the driving sub-circuits in a time division manner and a second scanning circuit configured to sequentially apply touch detection driving signals to the driving sub-circuits in a time division manner, for a touch detecting function display device that includes the plurality of common driving electrodes disposed in parallel so as to extend in one direction;

the plurality of scanning signal lines;

a display element performing a display based on a pixel signal and the display driving signal; and

a touch detection element detecting an external approaching object based on the touch detection driving signal,

wherein respective ones of the plurality of driving sub-circuits include a display priority circuit configured to receive inputs consisting of a corresponding one of the plurality of display scanning signals and a corresponding one of the plurality of touch detection signals, and

wherein the display priority circuit is configured such that;

in a case where the display priority circuit receives only the corresponding one of the display scanning signals at a given time, the display priority circuit applies the display driving signal to a corresponding one of the common driving electrodes derived from the received display scanning signal,

in a case where the display priority circuit receives only the corresponding one of the touch detection signals at the given time, the display priority circuit applies the touch detection driving signal to the corresponding one of the common driving electrodes derived from the received touch detection signal, and

in a case where the display priority circuit receives both the corresponding one of the display scanning signals and the corresponding one of the touch detection signals at the given time, the display priority circuit applies the display driving signal to the corresponding one of the common driving electrodes derived from the received display scanning signal.

10. A driving method of a touch detecting function display apparatus, the touch detection function display apparatus comprising a plurality of common driving electrodes that are disposed in parallel so as to extend in one direction, a plurality of scanning signal lines, a display element that performs display based on a pixel signal and a display driving signal, a touch detection element that detects an external approaching object based on a touch detection driving signal, and a plurality of driving circuits configured to drive the plurality of scanning signal lines and the plurality of common driving electrodes, a first scanning circuit, and a second scanning circuit, respective ones of the plurality of driving circuits including a display priority circuit configured to receive inputs consisting of a corresponding one of a plurality of display scanning signals and a corresponding one of a plurality of touch detection signals, the method comprising:

sequentially applying, using the first scanning circuit, the display scanning signals to the driving circuits in a time division manner;

sequentially applying, using the second scanning circuit, the touch detection signals to the driving circuits in a time division manner;

performing, using the second scanning circuit, second scanning driving at a scanning speed higher than a scanning speed of first scanning driving being driving the display element, and the second scanning driving being driving the touch detection element;

in a case where the display priority circuit receives only the corresponding one of the display scanning signals at a given time, the display priority circuit applies the display driving signal to a corresponding one of the common driving electrodes derived from the received display scanning signal,

in a case where the display priority circuit receives only the corresponding one of the touch detection signals at the given time, the display priority circuit applies the touch detection driving signal to the corresponding one of the common driving electrodes derived from the received touch detection signal, and

in a case where the display priority circuit receives both the corresponding one of the display scanning signals and the corresponding one of the touch detection signals at the given time, the display priority circuit applies the display driving signal to the corresponding one of the common driving electrodes derived from the received display scanning signal.

11. Electronic equipment comprising:

a touch detecting function display apparatus; and

a control circuit configured to perform an operation control using the touch detecting function display apparatus,

wherein the touch detecting function display apparatus includes

a plurality of common driving electrodes that are disposed in parallel so as to extend in one direction;

a plurality of scanning signal lines;

a display element that performs display based on a pixel signal and a display driving signal;

a touch detection element that detects an external approaching object based on a touch detection driving signal;

a plurality of driving circuits configured to drive the plurality of scanning signal lines and the plurality of common driving electrodes;

a first scanning circuit configured to sequentially apply display scanning signals to the driving circuits in a time division manner; and

a second scanning circuit configured to sequentially apply touch detection driving signals to the plurality of driving circuits in a time division manner,

wherein the second scanning circuit is configured to perform a second scanning driving at a scanning speed higher than a scanning speed of a first scanning driving, the first scanning driving being driving the display element and the second scanning driving being driving the touch detection element,

wherein respective ones of the plurality of driving circuits include a display priority circuit configured to receive a inputs consisting of corresponding one of the plurality of display scanning signals and a corresponding one of the plurality of touch detection signals, and

wherein the display priority circuit is configured such that;

in a case where the display priority circuit receives only the corresponding one of the display scanning signals at a given time, the display priority circuit applies the display driving signal to a corresponding one of the common driving electrodes derived from the received display scanning signal,

in a case where the display priority circuit receives only the corresponding one of the touch detection signals at the given time, the display priority circuit applies the touch detection driving signal to the corresponding one of the common driving electrodes derived from the received touch detection signal, and

in a case where the display priority circuit receives both the corresponding one of the display scanning signals and the corresponding one of the touch detection signals at the given time, the display priority circuit applies the display driving signal to the corresponding one of the common driving electrodes derived from the received display scanning signal.