US 12,216,751 B2
Apparatus and method for a multilayer pixel structure
Henricus Derckx, St Asaph (GB); Wilhelmus Van Lier, St Asaph (GB); and Michael A. Cowin, St Asaph (GB)
Assigned to TOUCH BIOMETRIX LIMITED, St. Asaph (GB)
Filed by TOUCH BIOMETRIX LIMITED, Wales (GB)
Filed on Dec. 7, 2023, as Appl. No. 18/531,979.
Application 18/531,979 is a continuation of application No. 17/616,477, granted, now 11,868,458, previously published as PCT/GB2020/051369, filed on Jun. 5, 2020.
Claims priority of application No. 1907998 (GB), filed on Jun. 5, 2019; application No. 1908040 (GB), filed on Jun. 5, 2019; application No. 1909209 (GB), filed on Jun. 26, 2019; and application No. 1913912 (GB), filed on Sep. 26, 2019.
Prior Publication US 2024/0111850 A1, Apr. 4, 2024
Int. Cl. G06F 3/044 (2006.01); G06F 3/0354 (2013.01); G06F 3/041 (2006.01); G06F 21/32 (2013.01); G06F 21/44 (2013.01); G06V 40/12 (2022.01); H01L 27/12 (2006.01); G06V 40/13 (2022.01)
CPC G06F 21/32 (2013.01) [G06F 3/03543 (2013.01); G06F 3/03547 (2013.01); G06F 3/041661 (2019.05); G06F 3/044 (2013.01); G06F 3/0446 (2019.05); G06F 21/44 (2013.01); G06V 40/1359 (2022.01); H01L 27/1255 (2013.01); H01L 27/127 (2013.01); G06F 2203/0336 (2013.01); G06V 40/1306 (2022.01); H01L 27/1218 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A pixel structure comprising a plurality of layers for providing a touch sensitive pixel of a sensing array, the pixel comprising:
a sense thin film transistor (TFT);
a select TFT coupled to the sense TFT; and
a capacitive sensing electrode coupled to the sense TFT;
wherein each TFT comprises: (i) a gate layer comprising a gate region of the TFT, (ii) a source-drain layer comprising a source region and a drain region of the TFT, and (iii) a channel region which connects the source region and the drain region to provide a conduction path therebetween when the TFT is in an on state;
wherein the pixel structure comprises a conductive layer arranged to provide the capacitive sensing electrode;
wherein a gate layer of the sense TFT is connected to the capacitive sensing electrode;
wherein the conduction path of the sense TFT is connected to the conduction path of the select TFT; and
wherein the conduction path of the sense TFT is connected between: (i) the conduction path of the select TFT, and (ii) a read-out line for the pixel.