CN112327140A - Capacitive touch screen sensor circuit detection board and detection method thereof - Google Patents

Abstract

The capacitive touch screen sensor circuit detection board and the detection method thereof provided by the invention can timely and quickly judge the defects of open circuit and short circuit of the sensor in the production process of a product, so as to avoid waste of other auxiliary materials and labor cost. In addition, the test device is also a universal design scheme, can not be influenced by the spatial arrangement of products, and is designed into a form more suitable for product testing according to the requirement of product testing, so that the testing efficiency is improved; the same test fixture can be fixedly used for testing different products, so that a fixture does not need to be designed for each product, and the waste of manpower, material resources and time cost is avoided; and a sufficient number of pads can be designed, and a plurality of products can be measured simultaneously, so that the test efficiency is further improved, the function test of products of a plurality of models can be reduced aiming at the products, the product detection speed is improved, and the test cost is reduced.

Description

Capacitive touch screen sensor circuit detection board and detection method thereof

Technical Field

The invention relates to the field of capacitive touch screens, in particular to a capacitive touch screen sensor circuit detection board and a detection method thereof.

Background

With the development of the electronic industry, touch screens have been applied to various electronic devices. The capacitive touch screen is popular with people due to high sensitivity and smooth operation. The sensor is a core component of the capacitive touch screen, and is generally composed of a driving circuit TX and a sensing circuit RX. The driving circuit TX consists of a plurality of channel circuits Chanel which are parallel to each other and are called TX Chanel; the inductive circuit RX is composed of a plurality of channel circuits Chanel parallel to each other, and is called RX Chanel. A node capacitance is formed between TX Chanel and RX Chanel. Taking finger touch as an example, when a finger touches the surface of the touch screen, a coupling capacitor is formed between the finger and the TX Chanel and the RX Chanel to cause weak change of current, and the capacitance change of a touch point is detected by scanning the TX electrode matrix and the RX electrode matrix to calculate the position of the finger.

When a short circuit occurs between adjacent channel circuits Chanel or an open circuit occurs in a channel circuit Chanel, the capacitance charging and discharging variation is abnormal, so that the detection touch coordinate is invalid and is a defective product or an unqualified product. Such defective products or defective products are mostly generated in the respective steps of production and manufacture. When every process finishes, need in time test the product, prevent that the defective products from flowing into next process, cause the waste of other auxiliary material and human cost.

In a traditional method for testing a capacitive touch screen, after a touch screen sensor is finished, a probe test or a false binding test is generally used for judging functions. The method has hysteresis, cannot monitor the production process of products, and selects out defective products in time, so that the defective products flow into the next process, and waste of other auxiliary materials and labor cost is caused. In addition, under the influence of product space and design, the number of product channels of each model is not completely the same, and the size and the interval of bound PIN are also different, so that when a Sensor is generally subjected to function test, each product is required to be designed and manufactured with a special test fixture aiming at the number, the size and the interval of bound PIN, and the waste of a large amount of manpower, material resources and time cost can be caused.

Disclosure of Invention

In order to solve the problems, the invention provides a capacitive touch screen sensor circuit detection board capable of detecting a product in real time in the product preparation process, which not only can realize real-time detection in the product preparation process, but also can realize real-time detection on products of different models (different numbers, sizes and intervals of bound PIN).

The circuit detection board is characterized by comprising a supporting frame, a detection frame, a test point outgoing line, a test point and a to-be-detected product placement area, wherein the size of the detection frame is consistent with the outline of the to-be-detected product, and the test point and the to-be-detected product are connected through the test point outgoing line and a binding PIN outgoing line. The product to be detected is a driving channel or a sensing channel or other sensors needing a detection circuit.

Furthermore, the binding PIN pinout can be a flexible pinout or a welding pinout. When the binding PIN outgoing line is a flexible outgoing line, one end of the binding PIN outgoing line is fixed on the test point outgoing line, and the other end of the binding PIN outgoing line can be connected with the binding PIN of the product to be tested.

Furthermore, the shape of the test point can be rectangle, square, circle and other shapes suitable for the detection of the product to be detected.

Furthermore, the positions of the test points are located in the areas outside the detection frame and inside the support frame, and the positions are not fixed, and can be other positions where the test points are sequentially arranged on the same side, are sequentially arranged on two sides, and are suitable for detection of a product to be detected.

Furthermore, the detection plate comprises a plurality of detection frames, the size of each detection frame can be the same or different, and the detection frames are consistent with the outline of the product to be detected.

Furthermore, the detection board can detect a plurality of products to be detected with the same model or different models at the same time.

In some specific embodiments, the detection board has a plurality of detection frames, and the test points are arranged at equal intervals on one side of the support frame, so that a plurality of products to be detected can be detected simultaneously.

The invention also provides a detection method of the capacitive touch screen sensor circuit, which comprises the following steps:

(1) in the production process, a product to be tested is manufactured in a detection frame, and a test point outgoing line are manufactured in the areas outside the detection frame and inside the support frame;

(2) connecting the binding PIN of the product to be tested with the outgoing line of the test point by using the binding PIN outgoing line;

(3) and detecting the resistance value or the capacitance value of the test point, and judging whether the product to be tested has a short circuit or open circuit condition.

The invention also provides a method for simultaneously detecting the sensor circuits of the capacitive touch screen in two types, which comprises the following steps:

(1) in the production process, a first product to be detected is manufactured in the first detection frame, and a second product to be detected is manufactured in the second detection frame;

(2) manufacturing test points and test point outgoing lines in areas outside the first detection frame and the second detection frame and in the supporting frame;

(3) connecting the binding PIN of the first product to be tested with the outgoing line of the test point by using a first binding PIN outgoing line;

(4) connecting the binding PIN of the second product to be tested with the outgoing line of the test point by using a second binding PIN outgoing line;

(5) and respectively detecting the resistance value or the capacitance value of the test point, and judging whether the first product to be tested and the second product to be tested have the short circuit or open circuit condition.

The invention also provides a method for simultaneously detecting the sensor circuits of the capacitive touch screen in various models, which is characterized by comprising the following steps:

(1) in the production process, making independent products to be detected with different models in the corresponding detection frame;

(2) manufacturing a test point and a test point outgoing line in the areas outside the detection frame and inside the support frame;

(3) respectively connecting each binding PIN through a binding PIN outgoing line and a test point outgoing line;

(4) and respectively detecting the resistance value or the capacitance value of the test point, and judging whether the short circuit or open circuit condition exists in each product to be tested.

The capacitive touch screen sensor circuit detection board and the detection method thereof provided by the invention can timely and quickly judge the open circuit and short circuit defects of the sensor in the production process of a product, so that defective products do not flow into the next process, and waste of other auxiliary materials and labor cost is avoided. In addition, the test point is also a universal design scheme, the signal of each PIN can be led to the position of the test point, and the test point is not influenced by the spatial arrangement of the product, so that the test point can be designed into a form more suitable for product testing according to the requirement of the product testing, for example, the size of Pad can be larger, thus a probe or other test fixtures can be very easily aligned to the test point, and the test efficiency is improved; the Pad can be made into a fixed size, a fixed interval and a fixed shape, so that different products can be tested by using the same test fixture, and thus, a fixture does not need to be designed for each product, and waste of manpower, material resources and time cost is avoided; in addition, a sufficient number of pads can be designed, and a group of test points can simultaneously measure a plurality of products, so that the test efficiency is further improved. Therefore, the function test of products of multiple models can be performed according to the product. The product detection speed can be improved, and the test cost can be reduced. The test device is particularly suitable for testing medium and small-sized products with one version and multiple pictures.

Drawings

FIG. 1 is a schematic diagram of a circuit detection board of a capacitive touch screen sensor according to the present invention;

fig. 2 is a schematic structural diagram of a corresponding position relationship after a product to be detected (i.e., a driving channel or a sensing channel) is placed in a capacitive touch screen circuit detection board provided by the invention;

FIG. 3 is a schematic diagram of a circuit detection board of a capacitive touch screen sensor according to the present invention, the circuit detection board including a plurality of detection frames;

fig. 4 is a schematic structural diagram of a corresponding position relationship after a plurality of products to be detected (i.e., driving channels or sensing channels) are placed in the capacitive touch screen circuit detection board provided by the invention;

in the figure: 1-a supporting frame, 2-a detecting frame, 3-a test point outgoing line, 4-a test point, 5-a product placement area to be tested, 6-a channel circuit body, 7-a channel circuit body outgoing line, 8-a bound PIN, 9-a bound PIN outgoing line, 12-a first product-to-be-tested detection frame, 15-a first product placement area to be tested, 16-a first product-to-be-tested channel circuit body, 17-a first product-to-be-tested channel circuit body outgoing line, 18-a first product-to-be-tested bound PIN, 19-a first product-to-be-tested bound PIN outgoing line, 22-a second product-to-be-tested detection frame, 25-a second product placement area to be tested, 26-a second product-to-be-tested channel circuit body, 27-a second product-to-be-tested channel circuit body outgoing line, and 29-binding a PIN outgoing line for the second product to be tested.

Detailed Description

In order to make the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 3, the invention provides a circuit detection board of a capacitive touch screen sensor, which comprises a supporting frame 1, a detection frame 2, a test point outgoing line 3, a test point 4 and a to-be-detected product placement area 5, wherein the size of the detection frame 2 is consistent with the outline of the to-be-detected product, and the test point 4 and the to-be-detected product are connected through the test point outgoing line 3 and a binding PIN outgoing line 9. The product to be measured can be a driving channel or a sensing channel or any other sensor requiring a measuring circuit. The binding PIN outgoing line 9 can be a flexible outgoing line or a welding outgoing line, when the binding PIN outgoing line is a flexible outgoing line, one end of the binding PIN outgoing line is fixed on the test point outgoing line 3, and the other end of the binding PIN outgoing line can be connected with the binding PIN8 of the product to be tested. The shape of the test point 4 can be rectangle, square, circle and other shapes suitable for the detection of the product to be tested. And the position of the test point 4 is located in the area outside the detection frame 2 and inside the support frame 1, and the position is not fixed, and can be other positions where the test points are arranged in sequence on the same side, arranged in sequence on two sides and suitable for detection of the product to be detected.

In some embodiments, the detection board includes a plurality of detection frames, and the detection frames may be the same or different in size, and the size is the same as the outline of the product to be detected, so that the detection board can be used for simultaneously detecting a plurality of products to be detected of the same type or different types.

The invention also provides a detection method of the capacitive touch screen sensor circuit, which can be particularly applied to the production process of medium and small size touch control products. The detection plate and the detection method provided by the invention will be further described with reference to specific embodiments below:

taking circuit detection of the driving channel as an example, as shown in fig. 2, in a production and manufacturing process of the driving channel of the capacitive touch screen sensor, 6 is a (driving, only example, the same below) channel circuit body; 7 is a (driving) channel circuit body outgoing line which is responsible for uniformly leading out each channel signal to the edge of a product and binding the signal with the FPC soft board; the step 8 is binding PIN, and the main function is to bind with the FPC soft board and conduct the signal of each channel and the binding PIN on the FPC soft board one to one; 9 is a binding PIN outgoing line used for leading the signal of each channel from the binding PIN to a test point outgoing line 3 on the test point 4; 1, the supporting frame can be a waste edge left after a product is manufactured in the actual production process of the sensor, and has the functions of supporting and protecting the product, setting some auxiliary targets and the like; 2, a detection frame which is also the outline of the product to be detected; the product placement area to be tested is the position for preparing the product to be tested (i.e. the driving channel in this embodiment).

According to the design of the invention, a PIN signal on each binding PIN8 is led to the position of a test point 4 through a binding PIN outgoing line 9, and whether the short circuit or open circuit condition exists in each product to be tested is judged by detecting the resistance value or capacitance value of the test point. When the resistance value between two or more than two test points is smaller than a set standard, such as 30M omega, the short circuit condition exists in the product to be tested; when the capacitance values corresponding to one or more test points exceed the set standard, the open circuit condition exists for the product to be tested.

In addition, the test points 4 are not affected by the spatial arrangement of the product, so the test points 4 can be designed into a form more suitable for the product test according to the requirement of the product test, for example, the size of the test points 4 can be larger, so that probes or other test jigs can be very easily aligned to the test points 4, thereby improving the test efficiency; in addition, the test points 4 can be made into fixed sizes, intervals and shapes, so that different products can be tested by using the same test jig, a jig does not need to be designed for each product, and waste of manpower, material resources and time cost is avoided; and enough test points 4 can be arranged, so that a group of test points can simultaneously measure a plurality of products, thereby further improving the test efficiency. Therefore, the function test of products of multiple models can be performed according to the product. The product detection speed can be improved, and the test cost can be reduced.

After the test is passed, the product to be tested (i.e. the driving channel in this embodiment) is separated from the contact with the parts 1, 4, 3 and 9 along the part 2, and the subsequent functions of the product to be tested are not affected. The product to be tested (i.e. the driving channel in this embodiment) after the contour molding includes (a driving, only an example, the same below) a channel circuit body 6, (a driving) channel circuit body outgoing line 7, a binding PIN8, and a partial binding PIN outgoing line 9.

The invention also provides a method for simultaneously detecting two or more types of different capacitive touch screen sensor circuits, which is illustrated by taking a driving channel (namely a first sample to be detected) and a sensing channel (namely a second sample to be detected) as examples. Referring to fig. 4, in the drawing, 1 is a supporting frame, 3 is a test point outgoing line, 4 is a test point, 12 is a first to-be-tested product detection frame, 15 is a first to-be-tested product placement area, 16 is a first to-be-tested product channel circuit body, 17 is a first to-be-tested product channel circuit body outgoing line, 18 is a first to-be-tested product binding PIN, 19 is a first to-be-tested product binding PIN outgoing line, 22 is a second to-be-tested product detection frame, 25 is a second to-be-tested product placement area, 26 is a second to-be-tested product channel circuit body, 27 is a second to-be-tested product channel circuit body outgoing line, 28 is a second to-be-tested product binding PIN, and 29 is a. The number, size and spacing of the bound PINs of the first product to be tested and the second product to be tested are different, and the signals of each channel of the bound PIN18 of the first product to be tested are led out to the test point 4 through the first product to be tested bound PIN lead-out wire 19. And leading out the signal of each channel of the second product binding PIN28 to be tested to the rest test points 4 through the second product binding PIN lead-out wire 29 to be tested. The test fixture is used for testing the test point 4, so that the test of A, B two products can be completed simultaneously. Of course, the number of channels in this embodiment is only for example and easy to understand, and the number of actual product channels may be equal to, more than or less than this example.

The above-mentioned embodiments are described in more detail, but the invention is not to be construed as being limited to the scope of the invention. It should be noted that, for those skilled in the relevant art, various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. The circuit detection board is characterized by comprising a supporting frame (1), a detection frame (2), a test point outgoing line (3), a test point (4) and a product placement area (5) to be detected, wherein the size of the detection frame (2) is consistent with the outline of the product to be detected, and the test point (4) and the product to be detected are connected with a binding PIN outgoing line (9) through the test point outgoing line (3).

2. A capacitive touch screen sensor circuit probe card according to claim 1, characterized in that the bound PIN outlets (9) may be flexible outlets or soldered outlets.

3. The capacitive touch screen sensor circuit board according to claim 2, characterized in that when the bound PIN lead (9) is a flexible lead, one end is fixed to the test point lead (3) and the other end is connectable to the bound PIN (8) of the product to be tested.

4. A capacitive touch screen sensor circuit board according to claim 1, characterized in that the test points (4) may be rectangular, square, circular and other shapes suitable for the detection of the product to be tested.

5. The sensor circuit board according to claim 1, wherein the test points (4) are located in the areas outside the test frame (2) and inside the support frame (1), and are not fixed, and may be arranged in sequence on the same side, on both sides, and at other positions suitable for the detection of the product to be detected.

6. The sensor circuit board of claim 1, wherein the board comprises a plurality of test frames, each of which may be the same or different in size and conforms to the outline of the product to be tested.

7. A capacitive touch screen sensor circuit detector board as claimed in claim 1, wherein the detector board can detect a plurality of products under test of the same type or different types simultaneously.

8. A method for detecting a capacitive touch screen sensor circuit, the method comprising the steps of:

in the production process, a product to be tested is manufactured in the detection frame (2), and test points (4) and test point outgoing lines (3) are manufactured in the areas outside the detection frame (2) and inside the support frame (1);

a binding PIN outgoing line (9) is used for connecting the binding PIN (8) of the product to be tested with the test point outgoing line (3);

and detecting the resistance value of the test point (4) to judge whether the product to be tested has a short circuit or open circuit condition.

9. A method for simultaneously detecting two types of capacitive touch screen sensor circuits is characterized by comprising the following steps:

in the production process, a first product to be detected is manufactured in the first detection frame (15), and a second product to be detected is manufactured in the second detection frame (25);

manufacturing test points (4) and test point outgoing lines (3) in areas outside the first detection frame (15) and the second detection frame (25) and inside the supporting frame (1);

connecting a binding PIN (18) of a first product to be tested with a test point outlet (3) by using a first binding PIN outlet (19);

connecting the binding PIN (28) of the second product to be tested with the test point outgoing line (3) by using a second binding PIN outgoing line (29);

and respectively detecting the resistance values of the test points (4) to judge whether the first product to be tested and the second product to be tested have short circuit or open circuit conditions.

10. A method for simultaneously detecting a plurality of types of capacitive touch screen sensor circuits, the method comprising the steps of:

in the production process, making independent products to be detected with different models in the corresponding detection frame;

manufacturing a test point and a test point outgoing line in the areas outside the detection frame and inside the support frame;

respectively connecting each binding PIN through a binding PIN outgoing line and a test point outgoing line;

and respectively detecting the resistance values of the test points, and judging whether the products to be tested have short circuit or open circuit conditions.

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