Self-capacitive touch panel

• US 9,274,657 B2
• Filed: 07/24/2013
• Issued: 03/01/2016
• Est. Priority Date: 07/25/2012
• Status: Active Grant

• Current Assignee: Ili Technology Corp. (MediaTek, Inc.)
• Original Assignee: MStar Semiconductor Incorporated (MediaTek, Inc.)
• Inventors: Liu, Chun-Chen, Tsai, Meng-Che
• Primary Examiner(s): Allgood, Alesa
• Application Number:
  US13/949,542
• Publication Number:
  US 20140028334A1
• Time in Patent Office: 951 Days
• US Class Current: 1/1
• CPC Class Codes: G01R 27/2605 Measuring capacitance capacitive sensors G01D5/24
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality

Abstract

A self-capacitive touch panel including a border region and a central region is provided. The border region has a first area and corresponds to a P number of first sensors. The central region has a second area and corresponds to a Q number of second sensors. A ratio of P to the first area is greater than a ratio of Q to the second area.

Claims

1. A self-capacitive touch panel, comprising:

a plurality of sensors;

a border region, wherein each unit area of the border region comprises an R number of electrodes corresponding to a P number of first sensors among the plurality of sensors; and

a central region, wherein each unit area of the central region comprises an M number of electrodes corresponding to a Q number of second sensors among the plurality of sensors;

wherein, a ratio of R to P is greater than a ratio of M to Q, wherein R and M are integers greater than 1, each of the P number of first sensors corresponds a plurality of first electrodes among the R number of electrodes, the plurality of first electrodes have a first center of gravity, each of the Q number of second sensors corresponds to a plurality of second electrodes among the M number of electrodes, and the plurality of second electrodes have a second center of gravity;

a first average distance between the first center of gravity and all possible touch points in the plurality first electrodes is smaller than a second average distance between the second center of gravity and all possible touch points in the plurality of second electrodes.

2. The self-capacitive touch panel according to claim 1, wherein a planar shape of the plurality of first electrodes approximates a first right triangle, a planar shape of the plurality of second electrodes approximates a second right triangle, a shortest side of the first right triangle is shorter than a shortest side of the second right triangle, and a second shortest side of the first right triangle is equal to a second shortest side of the second right triangle.