Capacitive touchscreens

Abstract

A capacitive touchscreen includes a substrate and a transparent conductive layer arranged on the substrate. The conductive layer includes a sensing area having a first side and a second side opposite to the first side. The capacitive touchscreen further includes multiple transparent and conductive first electrodes, multiple transparent and conductive second electrodes, and transparent and nonconductive patterns. Each first electrode includes a first trunk extending from the first side toward the second side. Each second electrode includes a second trunk and a wiring coupled to the second trunk. Both the second trunk and the wiring of each second electrode extend from the first side toward the second side. Each second trunk cooperates with a corresponding first trunks to be operable to sense a touched position. The transparent and nonconductive patterns are located between the first and second electrodes to electrically isolate the first electrodes from the second electrodes.

What is claimed is: 
     
         1 . A capacitive touchscreen, comprising:
 a substrate;   a transparent and conductive layer arranged on the substrate, the transparent and conductive layer comprising a sensing area, the sensing area having a first side and a second side opposite to the second side;   a plurality of transparent and conductive first electrodes, each of the plurality of transparent and conductive first electrodes comprising a first trunk extending from the first side toward the second side;   a plurality of transparent and conductive second electrodes, each of the plurality of transparent and conductive second electrodes comprising a second trunk and a wiring coupled to the second trunk, the second trunk and the wiring of each of the transparent and conductive second electrodes extending from the first side toward the second side, the second trunk of each of the plurality of transparent and conductive second electrodes cooperating with a corresponding first trunk to be operable to sense a touched position, the second trunk of each of the plurality of transparent and conductive second electrodes having a first end and a second end opposite to the first end, a linear distance between two first ends of two adjacent second trunks in a first direction from the first side toward the second side along a straight line being an unit length, and L being larger than 1 mm and smaller than 15 mm; and   a plurality of transparent and nonconductive patterns arranged between the plurality of transparent and conductive first electrodes and the plurality of transparent and conductive second electrodes to electrically isolate the plurality of transparent and conductive first electrodes from the plurality of transparent and conductive second electrodes.   
     
     
         2 . The capacitive touchscreen of  claim 1 , wherein each of the plurality of transparent and conductive first electrodes further comprises a plurality of first branches extending outwardly from the first trunk of each of the plurality of transparent and conductive first electrodes; each of the plurality of transparent and conductive second electrodes further comprises a plurality of second branches extending outwardly from the second trunk of each of the plurality of transparent and conductive second electrodes; each of the plurality of first branches and a corresponding second branch are arranged at an interval in a direction from the first side toward the second side. 
     
     
         3 . The capacitive touchscreen of  claim 2 , wherein each of the plurality of first branches is corresponding to two of the plurality of second branches and sandwiched between the two of the plurality of second branches. 
     
     
         4 . The capacitive touchscreen of  claim 2 , wherein each of the plurality of second branches is corresponding to two of the plurality of first branches and sandwiched between the two of the plurality of first branches. 
     
     
         5 . The capacitive touchscreen of  claim 1 , wherein each of the plurality of transparent and conductive first electrodes further comprises a plurality of first branches extending outwardly from the first trunk of each of the plurality of transparent and conductive first electrodes, and a plurality of third branches respectively extending from distal ends of the plurality of first branches in a direction from the first side toward the second side; the second trunk of each of the plurality of transparent and conductive second electrodes is at least partially located between a corresponding third branch and a corresponding first trunk. 
     
     
         6 . The capacitive touchscreen of  claim 5 , wherein the first trunk of each of the plurality of transparent and conductive first electrodes, an adjacent first branch, and an adjacent third branch partially surround a corresponding second trunk; the wiring of each of the plurality of transparent and conductive second electrodes is coupled to a corresponding second trunk through a gap defined between two adjacent third branches. 
     
     
         7 . The capacitive touchscreen of  claim 6 , wherein each of the plurality of first branches and a corresponding third branch form a T shape. 
     
     
         8 . The capacitive touchscreen of  claim 1 , wherein the first trunk of each of the transparent and conductive first electrodes extends from the first side toward the second side along a straight line; the second trunk of each of the transparent and conductive second electrodes extends from the first side toward the second side along a straight line. 
     
     
         9 . The capacitive touchscreen of  claim 1 , wherein L is larger than 4 mm and smaller than 7 mm. 
     
     
         10 . The capacitive touchscreen of  claim 9 , wherein the first trunk of each of the plurality of transparent and conductive first electrodes comprises a plurality of V-shape bent portions; each of the first trunk of each of the plurality of transparent and conductive first electrodes has a whole bent portion within the unit length L. 
     
     
         11 . The capacitive touchscreen of  claim 10 , wherein a distance H between a highest point and a lowest point of each of the plurality of V-shape bent portions in a second direction perpendicular to the first direction is larger than 0 and smaller than 0.866 L. 
     
     
         12 . The capacitive touchscreen of  claim 11 , wherein H is larger than 0 and smaller than 0.2887 L. 
     
     
         13 . The capacitive touchscreen of  claim 10 , wherein each of the plurality of V-shape bent portions is symmetrical with respect to a second direction perpendicular to the first direction; an angle α defined between segments of each of the plurality of V-shape bent portions is larger than 60 degrees and smaller than 180 degrees. 
     
     
         14 . The capacitive touchscreen of  claim 13 , wherein α is larger than 150 degrees and smaller than 180 degrees. 
     
     
         15 . The capacitive touchscreen of  claim 10 , wherein a ratio λ of a total length of the segments of each of the plurality of V-shape bent portions defining an angle therebetween to the unit length L is larger than 1 and smaller than 2. 
     
     
         16 . The capacitive touchscreen of  claim 15 , wherein λ is greater than 1 and smaller than 1.15. 
     
     
         17 . The capacitive touchscreen of  claim 1 , wherein the transparent and conductive layer further comprises a lead area adjacent to the sensing area, wherein the lead area comprises a plurality of first leads respectively and electrically coupled to the first trunks of the plurality of transparent and conductive first electrodes, and a plurality of second leads respectively and electrically coupled to the wirings of the plurality of transparent and conductive second electrodes. 
     
     
         18 . The capacitive touchscreen of  claim 17 , wherein each of the plurality of first leads and a corresponding first trunk extend from the first side toward the second side in a same straight line; each of the plurality of second leads and a corresponding wiring extend from the first side toward the second side in a same straight line. 
     
     
         19 . A capacitive touchscreen, comprising:
 a substrate;   a transparent and conductive layer arranged on the substrate, the conductive layer comprising a sensing area, the sensing area having a first side and a second side opposite to the second side;   a plurality of transparent and conductive first electrodes, each of the plurality of transparent and conductive first electrodes comprising a first trunk extending from the first side toward the second side along a straight line;   a plurality of transparent and conductive second electrodes, each of the plurality of transparent and conductive second electrodes comprising a second trunk and a wiring coupled to the second trunk, the wiring of each of the transparent and conductive second electrodes extending from the first side toward the second side, the second trunk of each of the plurality of transparent and conductive second electrodes extending from the first side toward the second side along a straight line, the second trunk of each of the plurality of transparent and conductive second electrodes cooperating with a corresponding first trunk to be operable to sense a touched position;   a plurality of transparent and nonconductive patterns arranged between the plurality of transparent and conductive first electrodes and the plurality of transparent and conductive second electrodes to electrically isolate the plurality of transparent and conductive first electrodes from the plurality of transparent and conductive second electrodes.   
     
     
         20 . A capacitive touchscreen, comprising:
 a substrate;   a transparent and conductive layer arranged on the substrate, the conductive layer comprising a sensing area, the sensing area having a first side and a second side opposite to the second side;   a plurality of transparent and conductive first electrodes, each of the plurality of transparent and conductive first electrodes comprising a first trunk extending from the first side toward the second side;   a plurality of transparent and conductive second electrodes, each of the plurality of transparent and conductive second electrodes comprising a second trunk and a wiring coupled to the second trunk, the second trunk and the wiring of each of the transparent and conductive second electrodes extending from the first side toward the second side, the second trunk of each of the plurality of transparent and conductive second electrodes cooperating with a corresponding first trunk to be operable to sense a touched position;   a plurality of transparent and nonconductive patterns arranged between the plurality of transparent and conductive first electrodes and the plurality of transparent and conductive second electrodes to electrically isolate the plurality of transparent and conductive first electrodes from the plurality of transparent and conductive second electrodes;   each of the plurality of transparent and conductive first electrodes further comprising a plurality of first branches extending outwardly from the first trunk of each of the plurality of transparent and conductive first electrodes, and a plurality of third branches respectively extending from distal ends of the plurality of first branches in a direction from the first side toward the second side;   the second trunk of each of the plurality of transparent and conductive second electrodes being at least partially located between a corresponding third branch and a corresponding first trunk.