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Mutual capacitance touch sensor , detection method thereof and touch display device

A touch-sensing and mutual-capacitance technology, applied in electrical digital data processing, instruments, computing, etc., can solve problems such as reducing the sensitivity of the touch-sensing device 13, and achieve the effects of avoiding metal bridging, avoiding parasitic capacitance, and improving sensitivity

Active Publication Date: 2011-09-28
SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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AI Technical Summary

Problems solved by technology

[0011] Because the color filter between the upper electrode 15 and the touch sensing device layer 13 and the insulating layer 14 are generally on the order of microns, the thickness is too small, resulting in a very large mutual capacitance between the upper electrode 15 and the touch sensing device 13, which reduces the touch sensitivity. Sensitivity of the sensing device 13

Method used

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  • Mutual capacitance touch sensor , detection method thereof and touch display device
  • Mutual capacitance touch sensor , detection method thereof and touch display device
  • Mutual capacitance touch sensor , detection method thereof and touch display device

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Embodiment Construction

[0045] In the touch sensing technology, the change of the detection signal before and after the touch directly determines the signal detection sensitivity, but the inventors have found that the magnitude of the parasitic capacitance affects the change of the detection signal. In order to verify the influence of the parasitic capacitance on the detection signal, the inventor under the following parameter conditions, such as Figure 4 The equivalent circuit shown is simulated: R1 = R2 = 100Ω, C1 = 0.5pF, C4 = C5 = 1pF, R3 = R4 = 1000Ω, C6 = 100pF, R5 = 1500Ω, parasitic capacitance C2 = C3, varying from 10pF to 200pF. Drive signal 3 sine waves, frequency 20MHz, peak-to-peak value 10V. Signal difference before and after touch Figure 6 shown.

[0046] Depend on Figure 6 It can be seen that the smaller the parasitic capacitance, the larger the signal difference before and after the touch, which is more conducive to improving the sensitivity of signal detection.

[0047] Based...

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Abstract

The invention provides a mutual capacitance touch sensor comprising a glass baseplate, a plurality of drive wires and a plurality of sensing wires, wherein the drive wires and the sensing wires are positioned on the glass baseplate. Mutual capacitance is formed between the driving wires and the sensing wires. The mutual capacitance touch sensor also comprises a printed circuit board positioned outside the glass baseplate, wherein extension parts of the driving wires and the sensing wires, and a plurality of metal bridges for connecting the extension parts of all the driving wires are formed on the printed circuit board. The invention also provides a detection method of the mutual capacitance touch sensor and a touch display device. According to the mutual capacitance touch sensor disclosed by invention, parasitic capacitance generated by the bridge joint of metal conductors can be reduced so as to further enhance the sensitivity of the touch sensor.

Description

technical field [0001] The invention relates to a touch-sensing input device, in particular to a mutual-capacitance touch-sensing device, a detection method thereof, and a touch display device. Background technique [0002] With the development of touch sensing technology, capacitive touch sensing devices have attracted more and more attention because of their advantages such as long life, high transmittance, and support for multi-point touch sensing. Capacitive touch sensing devices can be roughly classified into self-capacitance and mutual-capacitance. As an emerging technology among capacitive touch sensing devices, the mutual-capacitance touch sensing device can realize real multi-touch sensing, and it has a good suppression effect on noise and ground parasitic capacitance. This makes it possible to use it in embedded touch sensing. [0003] Such as figure 2 As shown, it is a schematic cross-sectional structure diagram of an existing external mutual capacitance touch ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044
Inventor 金利波陈悦王丽花邱承彬
Owner SHANGHAI TIANMA MICRO ELECTRONICS CO LTD
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