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

• US 9,035,202 B2
• Filed: 06/07/2011
• Issued: 05/19/2015
• Est. Priority Date: 08/23/2010
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Japan Display Incorporated
• Inventors: Mizuhashi, Hiroshi, Nakanishi, Takayuki
• Primary Examiner(s): Wang, Quan-Zhen
• Assistant Examiner(s): DICKE, CHAD M
• Application Number:
  US13/067,519
• Publication Number:
  US 20120044166A1
• Time in Patent Office: 1,442 Days
• Field of Search: 178 1801- 1806, 345173-178
• US Class Current: 178/18.06
• 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 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 scanning driving unit that performs first scanning driving for sequentially applying the display driving signal to the plurality of common driving electrodes in a time division manner and second scanning driving for sequentially applying the 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 simultaneously selects two or more common driving electrodes as targets of the second scanning driving,

wherein when the two or more common driving electrodes selected as targets of the second scanning driving includes a common driving electrode that overlaps with a common driving electrode selected as a target of the first scanning driving, the scanning driving unit applies the display driving signal to the overlapping common driving electrode, and applies the touch detection driving signal to common driving electrodes other than the overlapping common driving electrode among the two or more common driving electrodes selected as targets of the second scanning driving,

wherein the scanning driving unit includes a plurality of output circuits, a scanning control unit, a shift register unit, and a timing adjustment unit, the plurality of output circuits respectively corresponding to the plurality of common driving electrodes,

wherein each of the plurality of output circuits outputs the display driving signal or the touch detection driving signal to a corresponding common driving electrode based on a first output signal that includes a pulse indicating a period for outputting the display driving signal and a second output signal that includes a pulse indicating a period for outputting the touch detection driving signal, and outputs the display driving signal to the corresponding common driving electrode based on the first output signal in an overlap period during which a period of the pulse of the first output signal and a period of the pulse of the second output signal are overlapped,

wherein the scanning control unit outputs a control signal having a pulse with a pulse width which is M times a scanning pitch period, and a clock signal having N transitions during the scanning pitch period,

wherein the shift register unit performs serial parallel conversion on the control signal based on the clock signal to generate a plurality of parallel output signals having a pulse with a pulse width corresponding to the pulse width of the pulse of the control signal,

wherein the timing adjustment unit adjusts each output timing of the parallel output signals generated through the serial parallel conversion such that (1) the pulses of the parallel output signals are output at a timing corresponding to a start timing of the scanning pitch period, (2) the pulses of N parallel output signals are simultaneously output to N output circuits corresponding to N common driving electrodes adjacent to each other, and (3) start timings of the pulses of the parallel output signals are shifted by the scanning pitch period such that the shift increases by one scanning pitch period for each subsequent N common driving electrodes, and

wherein the timing adjustment unit outputs each adjusted parallel output signal as the second output signal.

2. The touch detecting function display apparatus according to claim 1, wherein the display driving signal is a rectangular wave signal, and

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.

3. The touch detecting function display apparatus according to claim 2, wherein the touch detection driving signal is a rectangular wave signal having amplitude larger than that of the display driving signal.

4. A display apparatus comprising:

a plurality of common driving electrodes;

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

a detection element that performs detection based on a detection driving signal; and

a scanning driving unit that performs first scanning driving for applying the display driving signal to the plurality of common driving electrodes and second scanning driving for applying the detection driving signal to the plurality of common driving electrodes at a scanning speed different from that of the first scanning driving,

wherein the scanning driving unit simultaneously selects two or more common driving electrodes as targets of the second scanning driving,

wherein when the two or more common driving electrodes selected as targets of the second scanning driving includes a common driving electrode that overlaps with a common driving electrode selected as a target of the first scanning driving, the scanning driving unit applies the display driving signal to the overlapping common driving electrode, and applies the touch detection driving signal to common driving electrodes other than the overlapping common driving electrode among the two or more common driving electrodes selected as targets of the second scanning driving,

wherein the scanning driving unit includes a plurality of output circuits, a scanning control unit, a shift register unit, and a timing adjustment unit, the plurality of output circuits respectively corresponding to the plurality of common driving electrodes,

wherein each of the plurality of output circuits outputs the display driving signal or the touch detection driving signal to a corresponding common driving electrode based on a first output signal that includes a pulse indicating a period for outputting the display driving signal and a second output signal that includes a pulse indicating a period for outputting the touch detection driving signal, and outputs the display driving signal to the corresponding common driving electrode based on the first output signal in an overlap period during which a period of the pulse of the first output signal and a period of the pulse of the second output signal are overlapped,

wherein the scanning control unit outputs a control signal having a pulse with a pulse width which is M times a scanning pitch period, and a clock signal having N transitions during the scanning pitch period,

wherein the shift register unit performs serial parallel conversion on the control signal based on the clock signal to generate a plurality of parallel output signals having a pulse with a pulse width corresponding to the pulse width of the pulse of the control signal,

wherein the timing adjustment unit adjusts each output timing of the parallel output signals generated through the serial parallel conversion such that (1) the pulses of the parallel output signals are output at a timing corresponding to a start timing of the scanning pitch period, (2) the pulses of N parallel output signals are simultaneously output to N output circuits corresponding to N common driving electrodes adjacent to each other, and (3) start timings of the pulses of the parallel output signals are shifted by the scanning pitch period such that the shift increases by one scanning pitch period for each subsequent N common driving electrodes, and

wherein the timing adjustment unit outputs each adjusted parallel output signal as the second output signal.

5. The display apparatus according to claim 4, wherein the scanning driving unit simultaneously selects a plurality of common driving electrodes during the second scanning driving.

6. The display apparatus according to claim 4, wherein the scanning driving unit performs the scanning so as to shift common driving electrodes which are selected by two or more during the second scanning driving.

7. A driving circuit comprising a scanning driving unit that performs first scanning driving for sequentially applying a display driving signal to a 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, for a touch detecting function display unit that includes the plurality of common driving electrodes disposed in parallel so as to extend in one direction;

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 the scanning driving unit performs the second scanning driving at a scanning speed higher than that of the first scanning driving, and simultaneously selects two or more common driving electrodes as targets of the second scanning driving,

wherein when the two or more common driving electrodes selected as targets of the second scanning driving includes a common driving electrode that overlaps with a common driving electrode selected as a target of the first scanning driving, the scanning driving unit applies the display driving signal to the overlapping common driving electrode, and applies the touch detection driving signal to common driving electrodes other than the overlapping common driving electrode among the two or more common driving electrodes selected as targets of the second scanning driving,

wherein the scanning driving unit includes a plurality of output circuits, a scanning control unit, a shift register unit, and a timing adjustment unit, the plurality of output circuits respectively corresponding to the plurality of common driving electrodes,

wherein each of the plurality of output circuits outputs the display driving signal or the touch detection driving signal to a corresponding common driving electrode based on a first output signal that includes a pulse indicating a period for outputting the display driving signal and a second output signal that includes a pulse indicating a period for outputting the touch detection driving signal, and outputs the display driving signal to the corresponding common driving electrode based on the first output signal in an overlap period during which a period of the pulse of the first output signal and a period of the pulse of the second output signal are overlapped,

wherein the scanning control unit outputs a control signal having a pulse with a pulse width which is M times a scanning pitch period, and a clock signal having N transitions during the scanning pitch period,

wherein the shift register unit performs serial parallel conversion on the control signal based on the clock signal to generate a plurality of parallel output signals having a pulse with a pulse width corresponding to the pulse width of the pulse of the control signal,

wherein the timing adjustment unit adjusts each output timing of the parallel output signals generated through the serial parallel conversion such that (1) the pulses of the parallel output signals are output at a timing corresponding to a start timing of the scanning pitch period, (2) the pulses of N parallel output signals are simultaneously output to N output circuits corresponding to N common driving electrodes adjacent to each other, and (3) start timings of the pulses of the parallel output signals are shifted by the scanning pitch period such that the shift increases by one scanning pitch period for each subsequent N common driving electrodes, and

wherein the timing adjustment unit outputs each adjusted parallel output signal as the second output signal.

8. A driving method of a touch detecting function display apparatus having a plurality of common driving electrodes and a plurality of output circuits, the plurality of common driving electrodes being disposed in parallel so as to extend in one direction, the plurality of output circuits respectively corresponding to the plurality of common driving electrodes, the driving method comprising:

performing first scanning driving for display based on a pixel signal and a display driving signal by sequentially applying the display driving signal to a plurality of common driving electrodes which are disposed in parallel so as to extend in one direction in a time division manner and sequentially applying the pixel signal to pixel electrodes corresponding to the common driving electrode to which the display driving signal is applied in synchronization with the application of the display driving signal in a time division manner;

performing second scanning driving for sequentially applying a touch detection driving signal used to detect an external approaching object to the plurality of common driving electrodes at a scanning speed higher than that of the first scanning driving in a time division manner;

simultaneously selecting two or more common driving electrodes as targets of the second scanning driving,

when the two or more common driving electrodes selected as targets of the second scanning driving includes a common driving electrode that overlaps with a common driving electrode selected as a target of the first scanning driving, applying the display driving signal to the overlapping common driving electrode, and applying the touch detection driving signal to common driving electrodes other than the overlapping common driving electrode among the two or more common driving electrodes selected as targets of the second scanning driving;

performing serial parallel conversion on a control signal having a pulse width which is M times a scanning pitch period based on a clock signal having N transitions during the scanning pitch period to generate a plurality of parallel output signals having a pulse with a pulse width corresponding to the pulse width of the pulse of the control signal;

adjusting, each output timing of the parallel output signals generated through the serial parallel conversion such that (1) the pulses of the parallel output signals are output at a timing corresponding to a start timing of the scanning pitch period, (2) the pulses of N parallel output signals are simultaneously output to N output circuits corresponding to N common driving electrodes adjacent to each other, and (3) start timings of the pulses of the parallel output signals are shifted by the scanning pitch period such that the shift increases by one scanning pitch period for each subsequent N common driving electrodes; and

outputting each adjusted parallel output signal as the second output signal, wherein each of the plurality of output circuits outputs the display driving signal or the touch detection driving signal to a corresponding common driving electrode based on a first output signal that includes a pulse indicating a period for outputting the display driving signal and a second output signal that includes a pulse indicating a period for outputting the touch detection driving signal, and outputs the display driving signal to the corresponding common driving electrode based on the first output signal in an overlap period during which a period of the pulse of the first output signal and a period of the pulse of the second output signal are overlapped.

9. Electronic equipment comprising:

a touch detecting function display apparatus; and

a control unit that performs 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 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 scanning driving unit that performs first scanning driving for sequentially applying the display driving signal to the plurality of common driving electrodes in a time division manner and second scanning driving for sequentially applying the 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 simultaneously selects two or more common driving electrodes as targets of the second scanning driving,

wherein when the two or more common driving electrodes selected as targets of the second scanning driving includes a common driving electrode that overlaps with a common driving electrode selected as a target of the first scanning driving, the scanning driving unit applies the display driving signal to the overlapping common driving electrode, and applies the touch detection driving signal to common driving electrodes other than the overlapping common driving electrode among the two or more common driving electrodes selected as targets of the second scanning driving,

wherein the scanning driving unit includes a plurality of output circuits, a scanning control unit, a shift register unit, and a timing adjustment unit, the plurality of output circuits respectively corresponding to the plurality of common driving electrodes,

wherein each of the plurality of output circuits outputs the display driving signal or the touch detection driving signal to a corresponding common driving electrode based on a first output signal that includes a pulse indicating a period for outputting the display driving signal and a second output signal that includes a pulse indicating a period for outputting the touch detection driving signal, and outputs the display driving signal to the corresponding common driving electrode based on the first output signal in an overlap period during which a period of the pulse of the first output signal and a period of the pulse of the second output signal are overlapped,

wherein the scanning control unit outputs a control signal having a pulse with a pulse width which is M times a scanning pitch period, and a clock signal having N transitions during the scanning pitch period,

wherein the shift register unit performs serial parallel conversion on the control signal based on the clock signal to generate a plurality of parallel output signals having a pulse with a pulse width corresponding to the pulse width of the pulse of the control signal,

wherein the timing adjustment unit adjusts each output timing of the parallel output signals generated through the serial parallel conversion such that (1) the pulses of the parallel output signals are output at a timing corresponding to a start timing of the scanning pitch period, (2) the pulses of N parallel output signals are simultaneously output to N output circuits corresponding to N common driving electrodes adjacent to each other, and (3) start timings of the pulses of the parallel output signals are shifted by the scanning pitch period such that the shift increases by one scanning pitch period for each subsequent N common driving electrodes, and

wherein the timing adjustment unit outputs each adjusted parallel output signal as the second output signal.