Coordinate indicating apparatus and method for driving thereof

• US 10,191,598 B2
• Filed: 09/04/2015
• Issued: 01/29/2019
• Est. Priority Date: 09/05/2014
• Status: Active Grant

• Current Assignee: Korean Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Original Assignee: Korea Advanced Institute of Science and Technology, Samsung Electronics Co. Ltd.
• Inventors: Park, Sung-soo, Kang, Byung-hoon, Park, Chang-byung, Cho, Gyu-hyeong
• Primary Examiner(s): Sharifi-Tafreshi, Koosha
• Application Number:
  US14/845,389
• Publication Number:
  US 20160070387A1
• Time in Patent Office: 1,243 Days
• Field of Search: 345173, 345174
• 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A coordinate indicating apparatus includes a channel electrode which includes a first plurality of electrodes arranged in a first direction and a second plurality of electrodes arranged in a second direction perpendicular to the first direction, and which has capacitance between the first plurality of electrodes and the second plurality of electrodes, the capacitance being changed by an approaching contact object; a driver configured to apply driving signals to the first plurality of electrodes simultaneously; a receiver configured to receive response signals from the second plurality of electrodes; and a controller configured to determine a location of the contact object based on the driving signals transmitted to the first plurality of electrodes and the response signals received from the second plurality of electrodes, wherein the driver is configured to simultaneously apply, to the first plurality of electrodes, continuous driving signals according to a matrix corresponding to a Hadamard matrix, and wherein the driving signals exclude a time section.

Claims

1. A coordinate indicating apparatus, comprising:

a channel electrode which includes a first plurality of electrodes arranged in a first direction and a second plurality of electrodes arranged in a second direction perpendicular to the first direction, and which has capacitance between the first plurality of electrodes and the second plurality of electrodes, the capacitance being changed by an approach of a contact object;

a driver configured to generate a driving signals from a plurality of input signals using a modified Hadamard matrix, and apply the driving signals to the first plurality of electrodes simultaneously;

a receiver configured to receive response signals from the second plurality of electrodes; and

a controller configured to determine a location of the contact object based on the driving signals transmitted to the first plurality of electrodes and the response signals received from the second plurality of electrodes,

wherein the modified Hadamard matrix comprises a Hadamard matrix modified to change all values of a column of which the all values are the same, to zero, and

wherein each column of the modified Hadamard matrix is corresponding to each time section on which the driving signal are applied to the first plurality of electrodes.

2. The coordinate indicating apparatus of claim 1, wherein the controller is configured to calculate capacitance at a plurality of points of intersection which are formed between the first plurality of electrodes and the second plurality of electrodes, and determine the location of the contact object based on the calculated capacitance.

3. The coordinate indicating apparatus of claim 1, wherein the first plurality of electrodes are divided into a plurality of sub groups which are continuously arranged into a plurality of channels, and

wherein the driver is configured to apply the driving signals to all electrodes in a single sub group simultaneously.

4. The coordinate indicating apparatus of claim 3, wherein the plurality of sub groups includes a first sub group and a second sub group, and wherein the driver is configured to apply continuous driving signals to all of the electrodes in the first sub group, and then apply continuous driving signals to all of the electrodes in the second sub group simultaneously.

5. The coordinate indicating apparatus of claim 4, wherein the first sub group and the second sub group share at least one electrode.

6. The coordinate indicating apparatus of claim 5, wherein the first sub group and the second sub group are continuously arranged.

7. The coordinate indicating apparatus of claim 5, wherein the controller is configured to calculate the location of the contact object based on first sub group capacitance, in which a first offset is applied to a first value based on a capacitance of the first sub group, and second sub group capacitance in which a second offset is applied to a second value based on capacitance of the second sub group, and

wherein the first offset and the second offset are determined such that the first sub group capacitance and the second sub group capacitance have a same value with respect to the shared first electrode.

8. The coordinate indicating apparatus of claim 3, wherein the driver is configured to apply the driving signals only to one sub group from among the plurality of sub groups.

9. The coordinate indicating apparatus of claim 8, wherein the electrodes in the one sub group to which the driving signals are applied are changed over a predetermined time unit.

10. The coordinate indicating apparatus of claim 1, wherein the receiver is configured to receive the response signals of the second plurality of electrodes in parallel in a plurality of channels.

11. The coordinate indicating apparatus of claim 1, wherein the driver is configured to generate, as driving signals, a first plurality of pulse signals, the first plurality of pulse signals starting with a rising edge and ending with a falling edge according to a first value of the matrix, and to generate, as driving signals, a second plurality of pulse signals, the second plurality of pulse signals starting with a falling edge and ending with a rising edge in response to a second value of the matrix.

12. The coordinate indicating apparatus of claim 11, wherein the receiver is configured to accumulate the response signals as a first plurality of response signals using a first capacitor, and as a second plurality of response signals using a second capacitor.

13. A coordinate indicating apparatus, comprising:

a channel electrode which includes a first plurality of electrodes arranged in a first direction and a second plurality of electrodes arranged in a second direction perpendicular to the first direction, and which has capacitance between the first plurality of electrodes and the second plurality of electrodes, the capacitance being changed by an approach of a contact object;

a driver configured to apply continuous driving signals corresponding to a modified Hadamaid matrix to the first plurality of electrodes simultaneously;

a receiver configured to receive response signals from the second plurality of electrodes; and

a controller configured to determine a location of the contact object based on the driving signals transmitted to the first plurality of electrodes and the response signals received from the second plurality of electrodes,

wherein the modified Hadamard matrix comprises a Hadamard matrix modified to change all values of a column of which the all values are the same, to zero, and

wherein each column of the modified Hadamard matrix is corresponding to each time section on which the driving signals are applied to the first plurality of electrodes.

14. The coordinate indicating apparatus of claim 13, wherein the first plurality of electrodes are divided into a plurality of sub groups which are continuously arranged into a plurality of channels,

wherein the plurality of sub groups includes a first sub group and a second sub group, the first sub group sharing at least one electrode with the second sub group,

wherein the controller is configured to calculate the location of the object based on a first sub group capacitance, in which a first offset is applied to a first value based on capacitance of the first sub group, and second sub group capacitance, in which a second offset is applied to a second value based on capacitance of the second sub group, and

wherein the first offset and the second offset are determined such that the first sub group capacitance and the second sub group capacitance have a same value with respect to the shared first electrode.