CN103197173A - A kind of testing method of capacitive touch screen - Google Patents

Abstract

The invention discloses a method for testing a capacitive touch screen, which comprises the following steps: s1, measuring the capacitance value of the intersection point of the transmission path Tx line of the transmitting signal and the transmission path Rx line of the receiving signal on the capacitive touch screen; s2, comparing the measured capacitance value with an initial standard threshold value; s3, if the measured capacitance value is not abnormal with the initial standard threshold value, the touch performance of the intersection point is normal; if the measured capacitance value is abnormal to the initial standard threshold value, the touch performance of the intersection point is abnormal. The invention has the advantages of convenient test, improved test efficiency, reduced test error, and effectively prevented defective products from flowing out.

Description

A kind of testing method of capacitive touch screen

technical field

  The invention relates to a testing method, in particular to a testing method for a capacitive touch screen.

Background technique

With the development of the electronics industry, touch screens have been fully used in various electronic devices. During the production process of installing and assembling the touch screen with electronic equipment, it is necessary to test the use status of the touch screen to prevent bad touch screen products from entering the market and causing inconvenience to consumers.

The traditional testing method for the capacitive touch screen is generally to put the touch screen into the corresponding test tool for scribing processing, and the staff observes to confirm whether there is a disconnection or no function. Due to the need for manual observation, errors are prone to occur, resulting in a high error detection rate, and as the fatigue of the staff increases, the error detection rate will increase, resulting in a low product yield rate.

Contents of the invention

The technical problem to be solved by the present invention is to provide a capacitive touch screen testing method with convenient testing, high testing efficiency and low error rate.

In order to solve the above technical problems, the present invention takes the following technical solutions:

A method for testing a capacitive touch screen, comprising the following steps:

S1, measuring the capacitance value of the intersection of the transmission path Tx line of the transmitting signal and the transmission path Rx line of the receiving signal on the capacitive touch screen;

S2, comparing the measured capacitance value with the initial standard threshold value;

S3. If there is no abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is normal; if there is an abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is abnormal.

Described test method also comprises the step:

S4, when the capacitance value at the intersection of the Tx line and the Rx line is abnormal with the initial standard threshold value, confirm whether the signal transmitted by the Tx line is received at the corresponding Rx line receiving end;

S5, if received, the Tx line and Rx line are normal paths; if not received, the Tx line and/or Rx line is open, and the capacitive touch screen is a defective product.

Described test method also comprises the step:

S6, detecting whether the signal transmitted by the Tx line is lost at the receiving end of the Rx line;

S7, if there is a loss, then further check whether there is a short circuit between the adjacent Tx lines and Rx lines, if there is a short circuit, then the capacitive touch screen is a defective product; if there is no loss, it means that there is a short circuit between adjacent lines. There is no short circuit condition.

The initial standard threshold value is the value of the average value of the measured capacitance of all samples at that time plus the positive and negative deviation, and the deviation is 15%.

The invention is convenient for testing, effectively improves the testing efficiency, reduces the probability of mistesting, effectively prevents defective products from flowing into the market, and improves the good product rate of products.

Description of drawings

    Accompanying drawing 1 is a schematic flow chart of the principle of the present invention.

Detailed ways

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

The invention discloses a testing method for a capacitive touch screen, which is used for testing the performance of the capacitive touch screen, prevents electronic equipment equipped with defective touch screens from entering the market, facilitates testing, and effectively improves testing efficiency.

As shown in accompanying drawing 1, a kind of testing method of capacitive touch screen comprises the following steps:

S1, measuring the capacitance value of the intersection of the transmission path Tx line of the transmitting signal and the transmission path Rx line of the receiving signal on the capacitive touch screen. The capacitive touch screen has several transmission paths Tx lines for transmitting signals and transmission path Rx lines for receiving signals, which are arranged alternately in the X-axis and Y-axis directions respectively, forming multiple intersections.

S2, comparing the measured capacitance value with an initial standard threshold value. The capacitance value of each intersection point of the Tx line and the Rx line is measured and obtained, and then the capacitance value of each intersection point is compared with the initial standard threshold value. The initial standard threshold value is the average value of the measured capacitance of all samples at that time plus the value of the positive and negative deviation, the deviation is 15%, because the average capacitance of each batch of samples will vary according to different materials and different processes Therefore, the average value of the current batch of samples shall prevail. Using the average value of the sample plus positive and negative deviations can better ensure the accuracy and efficiency of the test.

S3, if there is no abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is normal; if there is an abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is abnormal. When the capacitance values at all intersections are not abnormal compared with the initial standard threshold value, the performance of this capacitive touch screen is normal and it is a good product. If one or several intersections are abnormal compared with the initial standard threshold, it means that the touch performance at these places is abnormal, which will affect subsequent normal use.

Described test method also comprises the step:

S4. When the capacitance value at the intersection of the Tx line and the Rx line is abnormal with the initial standard threshold value, confirm whether the signal transmitted by the Tx line is received at the corresponding Rx line receiving end. If there is an abnormal situation, then further detect the specific situation of the touch screen.

S5, if received, the Tx line and Rx line are normal paths; if not received, the Tx line and/or Rx line is open, and the capacitive touch screen is a defective product, that is, no signal is received, then There are areas in the touch screen of this test where normal touch manipulation cannot be performed.

In order to further improve the accuracy of the test and improve the yield, the test method also includes steps:

S6, detecting whether the signal transmitted by the Tx line is lost at the receiving end of the Rx line.

S7, if there is loss, then further check whether there is a short circuit between the adjacent Tx lines and Rx lines, if there is a short circuit, then the capacitive touch screen is a defective product, if there is no short circuit, then it can continue to be used; if If there is no loss, it means that there is no short circuit between adjacent lines.

In addition, after the entire test is completed, if it passes successfully, it can be designed to display "Pass" or other signs, and if the test fails, it will display "Fail" or other signs to remind the testers.

Claims (4)

1. A test method for a capacitive touch screen, comprising the following steps: S1, measuring the capacitance value of the intersection of the transmission path Tx line of the transmitting signal and the transmission path Rx line of the receiving signal on the capacitive touch screen; S2, comparing the measured capacitance value with the initial standard threshold value; S3. If there is no abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is normal; if there is an abnormality between the measured capacitance value and the initial standard threshold value, the touch performance of the intersection point is abnormal. 2. the testing method of capacitive touch screen according to claim 1, is characterized in that, described testing method also comprises the step: S4, when the capacitance value at the intersection of the Tx line and the Rx line is abnormal with the initial standard threshold value, confirm whether the signal transmitted by the Tx line is received at the corresponding Rx line receiving end; S5, if received, the Tx line and Rx line are normal paths; if not received, the Tx line and/or Rx line is open, and the capacitive touch screen is a defective product. 3. the testing method of capacitive touch screen according to claim 1 or 2, is characterized in that, described testing method also comprises the step: S6, detecting whether the signal transmitted by the Tx line is lost at the receiving end of the Rx line; S7, if there is a loss, then further check whether there is a short circuit between the adjacent Tx lines and Rx lines, if there is a short circuit, then the capacitive touch screen is a defective product; if there is no loss, it means that there is a short circuit between adjacent lines. There is no short circuit condition. 4. The test method of a capacitive touch screen according to claim 3, wherein the initial standard threshold value is the average value of capacitance obtained by measuring all samples at that time plus the value of positive and negative deviations, and the deviation is 15%. .

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