FIG. 1 is a schematic cross sectional view of a display panel in the prior art. As illustrated in FIG. 1, a display panel with touch function in the prior art includes a first substrate 10′, a first electrode layer 20′, a liquid crystal layer 30′, a second substrate 40′ and a second electrode layer 50′ that are laminated from the bottom up.
FIG. 2 is a schematic diagram of each of the laminated layers of the display panel in the prior art. As illustrated in FIGS. 1 and 2, the first electrode layer 20′ is disposed on the first substrate 10′, and includes a plurality of first electrodes 21′ extending in a first direction (i.e., the Y direction) and arranged in a second direction (i.e., the X direction). The first electrode 21′ serves as a common electrode (i.e., a COM electrode) and receives a common voltage signal during a display period. The first electrode 21′ also serves as a touch driving electrode (i.e., a Tx electrode) and receives a touch driving signal during a touch recognizing period. The second electrode layer 50′ is disposed on the second substrate 40′, and includes a plurality of second electrodes 51′ extending in the second direction (i.e., the X direction) and arranged in the first direction (i.e., the Y direction) as shown. Intersection areas of the first electrode 21′ and the second electrode 51′ are formed in a projection plane of the array substrate 10′. During the touch recognizing period, the second electrode 51′ and the first electrode 21′ interact to perform a detection of a touched position.
FIG. 3 is an enlarged view of the area “U” of FIG. 2. As illustrated in FIG. 3, in the prior art, two adjacent first electrodes 21′ have a first central distance L1, and two adjacent second electrodes 51′ have a second central distance L2. The first electrode 21′ has a first electrode width W1 in the X direction, and two adjacent first electrodes 21′ have a first gap width D1 in the X direction. The second electrode 51′ has a second electrode width W2 in the Y direction, and two adjacent second electrodes 51′ have a second gap width D2 in the Y direction. The first central distance L1 equals to a sum of the first electrode width W1 and the first gap width D1 (i.e., L1=W1+D1). The second central distance L2 equals to a sum of the second electrode width W2 and the second gap width D2 (i.e., L2=W2+D2). Since the first electrode 21′ serves both for display driving and touch sensing functions, the central distance L1 of the two adjacent first electrodes in the display panel with a touch function in the prior art is generally far smaller than the central distance L2 of the two adjacent second electrodes, so as to have a better display effect. Generally, in the prior art, a ratio “k” between the first central distance L1 and the second central distance L2 generally is: 0.1≤k<0.5.
Since the difference between the first and second central distances is large, a finger position corresponding to the minimal detectable level difference (i.e., the touch accuracy) in the prior art is low, thereby deteriorating the touch performance and user experience.
USPTO Backgrounds
USPTO Backgrounds