ITO (Indium Tin Oxide) electrical characteristic detecting method and detecting system of capacitance type touch screen
A technology of capacitive touch screen and electrical characteristics, applied in the direction of material capacitance, measuring electricity, measuring device, etc., can solve problems such as cracking, silver wire cracking, ITO line cracking, etc., to increase detection, improve integrity, and promote application value. Effect
Inactive Publication Date: 2010-09-29
苏州崴展电子科技有限公司
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Problems solved by technology
The existing detection of ITO capacitive touch screen mainly judges the integrity of the ITO circuit by detecting the impedance value between the ITO circuits. , Leakage between lines and deviation of constraint impedance, etc. When the above-mentioned situation does not appear, it is judged that the touch screen product is a good product. In fact, for this kind of touch screen, there will be silver wire breakage or ITO line breakage. Appearance will also cause fatal defects on the touch screen, but the existing detection systems and detection methods cannot be detected for silver wire rupture or ITO circuit rupture. This application is designed based on this problem
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[0032] Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail:
[0033] Before using the method of the present invention to detect the touch screen, the existing impedance detection method can be used to detect the touch screen first. When the touch screen detected by the impedance value method is defective, it is not necessary to use the method of the present invention to directly determine the touch screen. Good product; when there is no bad problem in the touch screen detected by the existing impedance value method, the detection method of the present invention can be further used to further detect the capacitance field distribution of the touch screen, as follows figure 1 The shown touch screen is taken as an example. First, the implementation process of the ITO electrical characteristic detection method of the capacitive multi-touch screen of the present invention is described:
[0034] Step 1, set M rows and N...
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The invention relates to an ITO (Indium Tin Oxide) electrical characteristic detecting system of a capacitance type multipoint touch screen, which comprises an inductive electrode array circuit board, a sine wave phase measuring circuit and a sine wave signal control and data processing circuit, wherein the inductive electrode array circuit board is used for carrying a detected touch screen and respectively transmitting sine waves to all ITO circuit layers of the touch screen during the detection, the sine wave phase measuring circuit is used for measuring a phase difference between an input signal and an inducing signal; the capacitance field distributing condition between all ITO circuit layers and an inductive electrode and between two adjacent ITO circuit layer is obtained by adjusting the output of sine wave frequency; and that whether the electrical characteristic of an ITO line and a silver lead is favorable or not can be judged according to the capacitance field distribution, thereby realizing further detection of the yield of the touch screen and having greater popularization and application value.
Description
technical field [0001] The invention relates to the detection of a capacitive touch screen, in particular to the detection of the ITO electrical characteristics of the touch screen to judge whether the product is a good product or a defective product. Background technique [0002] Touch screens are being used more and more due to their advantages of durability, fast response, space saving, and easy communication. At present, the types of touch screens mainly include resistive touch screens and capacitive touch screens. Among them, the transparent film material made of ITO (indium tin oxide or indium tin oxide) is the key material for manufacturing capacitive multi-point touch screens. This kind of capacitive touch screen is made of at least two layers of ITO film, figure 1 Shown is a cross-sectional view of a capacitive touch screen, the outermost layer of which is two protective layers 30, 30', located inside the two protective layers 30, 30' are two ITO circuit layers 20,...
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IPC IPC(8): G01R31/02G01N27/24G06F3/044
Inventor 顾鉴
Owner 苏州崴展电子科技有限公司