TOUCH DETECTION DEVICE AND DISPLAY DEVICE HAVING TOUCH SENSOR FUNCTION

• US 20160154520A1
• Filed: 01/21/2016
• Published: 06/02/2016
• Est. Priority Date: 06/30/2009
• Status: Abandoned Application

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Ishizaki, Koji, Noguchi, Kouji, Takeuchi, Takeya, Nakanishi, Takayuki, Teranishi, Yasuyuki
• Application Number:
  US15/003,227
• Publication Number:
  US 20160154520A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• 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 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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: G06F 3/047 using sets of wires, e.g. crossed wires

Abstract

A touch detection device includes: a detection surface; a plurality of sensor lines formed from a plurality of types of wiring lines having a different line capacitance; and a touch detection unit which detects an electric variation generated in a plurality of the sensor lines in response to touch or proximity of a detection target object to the detection surface, wherein the touch detection unit has an operational circuit for generating a detection signal representing the electric variation by performing an operation process using a line capacitance ratio for a plurality of outputs from a plurality of types of the sensor lines neighboring to one another with a different line capacitance.

Claims

1-20. -20. (canceled)

21. A touch detection device comprising:

a detection surface;

driving electrodes each extending in a first direction;

sensor lines each extending in a second direction that crosses the first direction, wherein the sensor lines are formed from types of wiring lines, which include a first sensor line and a second sensor line that has a different length from a length of the first sensor line;

a touch detection unit that detects an electric variation generated in the sensor lines associated with touch or proximity of a detection target object to the detection surface,

wherein the touch detection unit has an operational circuit for generating a detection signal corresponding to the detected electric variation at the adjacent independent sensor lines.

22. The touch detection device according to claim 21,

wherein the sensor lines are formed from M types of wiring lines that have the different length for each type and are arranged in parallel to one another, and M sensor lines neighboring to one another are a different type,

wherein the first sensor line has a longest length among the M sensor lines, and

wherein the second sensor line has a shortest length among the M sensor lines.

23. The touch detection device according to claim 22, wherein the M sensor lines are formed from wiring lines having a same material, a same thickness, a same width, and different lengths,

wherein each of the M sensor lines has a length which is a K multiple (where, K=1 to N) of a length L of the second sensor line having a shortest length, and

wherein the operational circuit obtains the detection signal by selecting two sensor lines including a longest sensor line from the M sensor lines, sampling two outputs from the two sensor lines at a timing corresponding to a ratio of the lengths of the two selected sensor lines, and performing a difference operation for sampling values.

24. The touch detection device according to claim 23, wherein the coefficients M and N are set to 3.

25. The touch detection device according to claim 22, wherein the M sensor lines are formed from wiring lines having a same material, a same thickness, a same width, and different lengths,

wherein each of the M sensor lines has a length which is a K multiple (where, K=1 to N) of a length L of the second sensor line having a shortest length, and

wherein the operational circuit obtains the detection signal by selecting two sensor lines from the M sensor lines, obtaining a difference of outputs for the two selected sensor lines of which a ratio of lengths is set to k (where, k is a natural number equal to or larger than 2), and removing the obtained difference with (k−

1).

26. The touch detection device according to claim 22, wherein one of the operation circuits and another operation circuit are connected to the same sensor line, and different types of sensor lines are arranged in symmetry with respect to the sensor line common to the two operational circuits.

27. The touch detection device according to claim 22, wherein the different types of M sensor lines are periodically repeatedly arranged.

28. The touch detection device according to claim 21,

wherein the sensor lines are formed from M types of wiring lines that have the different length for each type and are arranged in parallel to one another,

wherein the first sensor line has a longest length among the M sensor lines,

wherein the second sensor line has a shortest length among the M sensor lines,

wherein each of the driving electrodes is capacitively coupled to the sensor lines,

wherein the driving electrodes are arranged in parallel, and

wherein the touch detection device further includes a scan driving unit that sequentially voltage-driving (scanning) the driving electrodes from a driving electrode of one end to a driving electrode of the other end.

29. The touch detection device according to claim 27, wherein the touch detection unit obtains a position of the detection target object based on the detection signal generated from the operational circuit and time information synchronized with the scanning of the scan driving unit.

30. The touch detection device according to claim 22, wherein each of the operational circuits for each of the M sensor lines that neighbor to one another and have a different type includes a reset switch for simultaneously resetting electric potentials of the sensor lines in all of the operational circuits.

31. The touch detection device according to claim 22, further comprising a conductive layer for shielding a sensor line of a type having a shortest length out of the M sensor lines.

32. A display device having a touch sensor function, the display device comprising:

a display surface;

image signal lines;

a display function layer that changes display of the display surface in response to signal voltages applied to the image signal lines;

driving electrodes each extending in a first direction;

sensor lines each extending in a second direction that crosses the first direction, wherein the sensor lines are formed from types of wiring lines, which include a first sensor line and a second sensor line that has a different length from a length of the first sensor line; and

a touch detection unit that detects an electric variation generated from the sensor lines in response to touch or proximity of a detection target object to the display surface,

wherein the sensor lines are formed from different types of wiring lines having a different line capacitance due to the different length for each type, and

wherein the touch detection unit includes an operational circuit for generating a detection signal corresponding to the detected electric variation at the adjacent independent sensor lines.

33. The display device according to claim 32,

wherein the sensor lines are formed from M types of wiring lines that have the different length for each type and are arranged in parallel to one another, and M sensor lines neighboring to one another are a different type,

wherein the first sensor line has a longest length among the M sensor lines,

wherein the second sensor line has a shortest length among the M sensor lines, and

wherein the touch detection unit has the operational circuit provided for each of the M sensor lines that neighbor to one another and are a different type.

34. The display device according to claim 33, wherein the M sensor lines are formed from wiring lines having a same material, a same thickness, a same width, and different lengths,

wherein each of the M sensor lines has a length which is a K multiple (where, K=1 to N) of a length L of the second sensor line having a shortest length, and

wherein the operational circuit obtains the detection signal by selecting two sensor lines including a longest sensor line from the M sensor lines, sampling two outputs from the two sensor lines at a timing corresponding to a ratio of the lengths of the two selected sensor lines, and performing a difference operation for sampling values.

35. The display device according to claim 33, wherein the sensor line having a maximum length out of the M sensor lines intersects with two opposite sides of an effective display area of the display surface, and the sensor line having a minimum length out of the M sensor lines is disposed outside the effective display area.