MULTITOUCH RECOGNIZING DEVICE

• US 20140146020A1
• Filed: 06/29/2012
• Published: 05/29/2014
• Est. Priority Date: 07/01/2011
• Status: Active Grant

• Current Assignee: Rndplus Co., Ltd.
• Original Assignee: Rndplus Co., Ltd.
• Inventors: An, Suk Min, Han, Hong Hee, Jung, Gu Berm
• Granted Patent: US 9,292,132 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• 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 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/0428 by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual sensing beam interruptions in a planar beam grid of an optical touch-screen G06F3/0421

Abstract

A multi-touch recognizing device for distinguishing an illusion from an actually touched position and an illusion position by using an inclination angle measuring method, minimizing time for measuring a touch position, and more accurately measuring the position is provided.

Claims

1. A multitouch recognizing device comprising:

a plurality of transmitting unit groups constituted by grouping touch measurement signal transmitting units for radially transmitting successive touch measurement signals to receiving module groups;

a plurality of receiving module groups comprising at least three receiving modules located at a right angle, an acute angle, and an obtuse angle to the transmitting unit groups for simultaneously receiving the touch measurement signals transmitted by the transmitting unit groups such that each of the receiving modules simultaneously receive the touch measurement signals at the right angle, the acute angle, and the obtuse angle;

a transmitting unit driving clock unit for providing a driving clock to simultaneously drive the touch measurement signal transmitting units having the same index in each of the transmitting unit groups;

a control unit for calculating x and y coordinates or a diameter of a touch region based on the touch measurement signals received by the receiving module groups; and

a touch panel for allowing a user to input an touch input.

3. The multitouch recognizing device according to claim 1, wherein the control unit calculates orthogonal coordinates obtained by the orthogonal touch measurement signal of touch coordinates using the following equations.

4. The multitouch recognizing device according to claim 3, wherein the orthogonal coordinates are converted into inclination coordinates having an acute or obtuse angle corresponding thereto to determine whether a ghost image is present.

5. The multitouch recognizing device according to claim 4, wherein determination as to whether the ghost image is present is performed based on obtuse inclination coordinates obtained by converting the orthogonal coordinates using Equation 13 and Equation 14 below.

6. The multitouch recognizing device according to claim 4, wherein determination as to whether the ghost image is present is performed based on acute inclination coordinates obtained by converting the orthogonal coordinates using Equation 17 and Equation 18 below.

7. The multitouch recognizing device according to claim 5, wherein, it is determined that the ghost image is present in a case in which D_xr(n) and D_yr(n) decided by Equation 15 and Equation 16 below is equal to or greater than predetermined limit values.

D_xr(n)=|x_T(n)−

x_TC(n) 

 

Equation 15

D_yr(n)=|y_T(n)−

y_TC(n)| 

 

Equation 16

(Where X_T and Y_T are measured coordinates of a real touch object during oblique (acute) scanning and X_TC and Y_TC are inclination coordinates converted from the orthogonal coordinates.)

8. The multitouch recognizing device according to claim 1, wherein coordinate values measured from the touch region are calculated and used as normalized touch measurement values (N_x(k), N_y(k)).

9. The multitouch recognizing device according to claim 8, wherein the measured coordinate values of the touch region are normalized by Equation 1 and Equation 2 below and the normalized measurement values (N_x(k), N_y(k)) of the touch region are corrected by Equation 9 and Equation 10 below

10. The multitouch recognizing device according to claim 9, wherein the coordinates or the diameter of the touch region is calculated using values greater than a predetermined first reference value (T_lower) and less than a predetermined second reference value (T_higher) among the normalized values (N_x, N_y) of the measured touch signals.

11. The multitouch recognizing device according to claim 10, wherein the first reference value (T_lower) and the predetermined second reference value (T_higher) are decided by probability density functions calculated by Equation 7 and Equation 8 below.

12. The multitouch recognizing device according to claim 1, wherein the control unit calculates the diameter [dx(n), dy(n)] of the touch region based on the touch measurement signals to determine whether a touch recognition condition is satisfied.

13. The multitouch recognizing device according to claim 1, wherein the transmitting elements and the receiving elements are alternately arranged on the same line.

2. A multitouch recognizing device comprising:

a transmitting module comprising at least one transmitting element for radially transmitting a touch measurement signal comprising a pulse;

a receiving module comprising at least one receiving element for receiving the touch measurement signal transmitted by the transmitting module;

a control unit for calculating coordinates or a diameter of a touch region based on the touch measurement signal received by the receiving module groups; and

a touch panel for allowing a user to input an touch input, wherein

the receiving elements located at a right angle, an obtuse angle, and an acute angle to the transmitting element successively receive touch measurement signal radially transmitted by the transmitting element as an orthogonal, acute, or obtuse touch measurement signal.

14. The multitouch recognizing device according to claim 2, wherein the control unit calculates orthogonal coordinates obtained by the orthogonal touch measurement signal of touch coordinates using the following equations.

15. The multitouch recognizing device according to claim 2, wherein coordinate values measured from the touch region are calculated and used as normalized touch measurement values (N_x(k), N_y(k)).

16. The multitouch recognizing device according to claim 2, wherein the control unit calculates the diameter [dx(n), dy(n)] of the touch region based on the touch measurement signals to determine whether a touch recognition condition is satisfied.

17. The multitouch recognizing device according to claim 2, wherein the transmitting elements and the receiving elements are alternately arranged on the same line.