Touch screen channel short circuit detection method

Abstract

The invention relates to the technical field of touch screens, in particular to a touch screen channel short circuit detection method which comprises the following steps: S1, controlling RX channels located in odd columns in a to-be-detected screen to be electrified, and grounding the rest RX channels; s2, scanning through TX channels in the to-be-tested screen in sequence to obtain first signal values corresponding to RX channels in odd columns in the to-be-tested screen; s3, controlling the RX channels in even columns in the to-be-tested screen to be electrified, and grounding the rest RX channels; s4, scanning through TX channels in the to-be-tested screen in sequence to obtain second signal values corresponding to RX channels in even columns in the to-be-tested screen; and S5, combining the first signal value and the second signal value, and verifying the obtained combined value and a standard value to determine a short-circuit channel in the to-be-tested screen. According to the method, the short-circuit defect in the touch screen can be quickly judged in the product production process, so that the yield of products is improved.

Description

Technical Field

[0001] This invention relates to the technical field of touch screens, specifically to a method for detecting short circuits in touch screen channels. Background Technology

[0002] Capacitive touchscreens, as a type of human-computer interaction device, are finding increasingly widespread applications. Users perform basic touch actions such as clicking, swiping, or lifting on the touchscreen to generate various types of touch gestures. A capacitive touchscreen includes a TX channel, an RX channel intersecting the TX channel, and sensor capacitors formed at the intersections of the TX and RX channels. Each sensor capacitor has mutual capacitance. The touchscreen driver senses changes in the voltage charged to the sensor capacitors before or after a touch operation and uses conductive materials to determine the presence of touch input. When touch input is present, the touchscreen driver locates the position of the touch input. During touchscreen manufacturing, short circuits may occur in the channels, affecting product quality; therefore, a method for quickly detecting short circuits is needed. Summary of the Invention

[0003] The purpose of this invention is to provide a short-circuit detection method for touch screen channels to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a short-circuit detection method for a touchscreen channel, comprising the following steps:

[0005] S1: Power on the RX channels in the odd-numbered columns of the screen under test, and ground the remaining RX channels;

[0006] S2: Scan through the TX channel of the screen under test in sequence to obtain the first signal value corresponding to the odd-numbered RX channel of the screen under test;

[0007] S3: Power on the even-numbered RX channels in the screen under test, and ground the remaining RX channels;

[0008] S4: Scan through the TX channel of the screen under test in sequence to obtain the second signal value corresponding to the even-numbered RX channel of the screen under test;

[0009] S5: Combine the first signal value and the second signal value, and verify the combined value with the standard value to determine the short-circuit channel in the screen under test.

[0010] Preferably, the standard value is obtained in the following ways:

[0011] T1: Controls the RX channels located in odd-numbered columns of the standard screen to be powered on, while the remaining RX channels are grounded;

[0012] T2: Scan through the TX channel in the standard screen in sequence to obtain the third signal value corresponding to the RX channel of the odd-numbered columns in the standard screen;

[0013] T3: Power on the even-numbered RX channels in the standard screen, and ground the remaining RX channels;

[0014] T4: Scan through the TX channel in the standard screen in sequence to obtain the fourth signal value corresponding to the even-numbered RX channel in the standard screen;

[0015] T5: Combine the third signal value and the fourth signal value to obtain the standard value.

[0016] Preferably, the specific operation of scanning through the TX channels of the screen under test in step S2 is as follows: each TX channel of the screen under test is powered on sequentially for scanning, and when there is a powered TX channel in the screen under test, all remaining TX channels are grounded.

[0017] Preferably, the method for obtaining the first signal value or the second signal value includes:

[0018] Obtain the voltage value corresponding to the odd-numbered or even-numbered RX channels in the screen under test;

[0019] The voltage value is converted into a digital signal value using an analog-to-digital converter.

[0020] Preferably, in step S2, when scanning through the TX channel of the screen under test, the fifth signal value corresponding to the TX channel is collected sequentially, and the first signal value, the second signal value, and the fifth signal value are merged.

[0021] Preferably, the combined value obtained by combining the first signal value, the second signal value, and the fifth signal value is verified with the standard value to determine the short-circuit channel in the screen under test.

[0022] Preferably, the specific operation of determining the short-circuit channel in the screen under test is as follows:

[0023] Filter the merged values ​​to find the target fifth signal value whose difference from the standard value is greater than a preset value, and the target TX channel corresponding to the target fifth signal value;

[0024] The TX channel adjacent to the target TX channel is identified as a short-circuit channel.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This invention proposes a short-circuit detection method for touchscreen channels. It controls the RX channels in odd-numbered columns of the screen under test to be powered on, while the remaining RX channels are grounded. The method then scans the TX channels of the screen under test sequentially to obtain the first signal value corresponding to the RX channels in odd-numbered columns. Conversely, it controls the RX channels in even-numbered columns to be powered on, while the remaining RX channels are grounded. The method then scans the TX channels of the screen under test sequentially to obtain the second signal value corresponding to the RX channels in even-numbered columns. The first and second signal values ​​are then combined, and the combined value is verified against a standard value to identify the short-circuit channel in the screen under test. This method can quickly identify short-circuit defects in touchscreens during product manufacturing, thereby improving product yield. Attached Figure Description

[0027] Figure 1 This is a flowchart of the method steps of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figure 1 This invention provides a technical solution: a method for detecting short circuits in a touchscreen channel, comprising the following steps:

[0030] S1: Power on the RX channels in the odd-numbered columns of the screen under test, and ground the remaining RX channels;

[0031] S2: Scan through the TX channel of the screen under test in sequence to obtain the first signal value corresponding to the odd-numbered RX channel of the screen under test;

[0032] S3: Power on the even-numbered RX channels in the screen under test, and ground the remaining RX channels;

[0033] S4: Scan through the TX channel of the screen under test in sequence to obtain the second signal value corresponding to the even-numbered RX channel of the screen under test;

[0034] S5: Combine the first signal value and the second signal value, and verify the combined value with the standard value to determine the short-circuit channel in the screen under test.

[0035] The screen under test can be a capacitive touchscreen. The touchscreen can include multiple TX channels T1 to Tj (where j is a positive integer less than n) and multiple RX channels R1 to Ri (where i is a positive integer less than m) that intersect with the TX channels T1 to Tj. The TX channels can be arranged along the X direction (horizontal direction), and the RX channels can be arranged along the Y direction (perpendicular to the horizontal direction). The touchscreen includes multiple mutually perpendicular RX channels and TX channels. It should be noted that the touchscreen can also include i*j sensor capacitors formed at the intersection of the TX channels T1 to Tj and the RX channels R1 to Ri.

[0036] The methods for obtaining standard values ​​include:

[0037] T1: Controls the RX channels located in odd-numbered columns of the standard screen to be powered on, while the remaining RX channels are grounded;

[0038] T2: Scan through the TX channel in the standard screen in sequence to obtain the third signal value corresponding to the odd-numbered RX channel in the standard screen;

[0039] T3: Controls the RX channels in even-numbered columns of the standard screen to be powered on, while the remaining RX channels are grounded;

[0040] T4: Scan through the TX channel in the standard screen in sequence to obtain the fourth signal value corresponding to the even-numbered RX channel in the standard screen;

[0041] T5: Combine the third and fourth signal values ​​to obtain the standard value.

[0042] The specific operation of scanning through the TX channels of the screen under test in S2 is as follows: each TX channel of the screen under test is powered on in sequence for scanning, and when there is a powered TX channel in the screen under test, all the remaining TX channels are grounded.

[0043] The methods for obtaining the first or second signal value include:

[0044] Obtain the voltage value corresponding to the odd or even column of the RX channel in the screen under test;

[0045] The voltage value is converted into a digital signal value through an analog-to-digital converter.

[0046] In S2, when scanning through the TX channel of the screen under test in sequence, the fifth signal value corresponding to the TX channel is collected in sequence, and the first signal value, the second signal value and the fifth signal value are merged.

[0047] The combined value obtained by combining the first, second, and fifth signal values ​​is verified against the standard value to determine the short-circuit path in the screen under test.

[0048] The specific steps to identify the short-circuit channel in the screen under test are as follows:

[0049] Filter the merged values ​​to find the target fifth signal value whose difference from the standard value is greater than a preset value, and the target TX channel corresponding to the target fifth signal value;

[0050] The TX channel adjacent to the target TX channel is identified as the short-circuit channel.

[0051] The present invention also provides a detection system adapted to the above method, comprising: a first processing module for controlling the RX channels in the odd-numbered columns of the screen under test to be powered on, and the remaining RX channels to be grounded; a first scanning module for sequentially scanning the TX channels in the screen under test to obtain a first signal value corresponding to the RX channels in the odd-numbered columns of the screen under test; a second processing module for controlling the RX channels in the even-numbered columns of the screen under test to be powered on, and the remaining RX channels to be grounded; a second scanning module for sequentially scanning the TX channels in the screen under test to obtain a second signal value corresponding to the RX channels in the even-numbered columns of the screen under test; and a verification module for merging the first signal value and the second signal value, and verifying the merged value with a standard value to determine the short-circuit channel in the screen under test.

[0052] This invention also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the steps in the touchscreen channel short-circuit detection method provided by this invention by calling the computer program stored in the memory.

[0053] This invention also provides a storage medium storing a computer program adapted for loading by a processor to execute the steps in the touchscreen channel short-circuit detection method provided by this invention.

[0054] This invention proposes a short-circuit detection method for touchscreen channels. It controls the RX channels in odd-numbered columns of the screen under test to be powered on, while the remaining RX channels are grounded. The method then scans the TX channels of the screen under test sequentially to obtain the first signal value corresponding to the RX channels in odd-numbered columns. Conversely, it controls the RX channels in even-numbered columns to be powered on, while the remaining RX channels are grounded. The method then scans the TX channels of the screen under test sequentially to obtain the second signal value corresponding to the RX channels in even-numbered columns. The first and second signal values ​​are then combined, and the combined value is verified against a standard value to identify the short-circuit channel in the screen under test. This method can quickly identify short-circuit defects in touchscreens during product manufacturing, thereby improving product yield.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for detecting short circuits in a touchscreen channel, characterized in that: It includes the following steps: S1: Power on the RX channels in the odd-numbered columns of the screen under test, and ground the remaining RX channels; S2: Scan through the TX channel of the screen under test in sequence to obtain the first signal value corresponding to the odd-numbered RX channel of the screen under test; S3: Power on the even-numbered RX channels in the screen under test, and ground the remaining RX channels; S4: Scan through the TX channel of the screen under test in sequence to obtain the second signal value corresponding to the even-numbered RX channel of the screen under test; S5: Combine the first signal value and the second signal value, and verify the combined value with the standard value to determine the short-circuit channel in the screen under test.

2. The short-circuit detection method for a touchscreen channel according to claim 1, characterized in that: The methods for obtaining the standard value include: T1: Controls the RX channels located in odd-numbered columns of the standard screen to be powered on, while the remaining RX channels are grounded; T2: Scan through the TX channel in the standard screen in sequence to obtain the third signal value corresponding to the RX channel of the odd-numbered columns in the standard screen; T3: Power on the even-numbered RX channels in the standard screen, and ground the remaining RX channels; T4: Scan through the TX channel in the standard screen in sequence to obtain the fourth signal value corresponding to the even-numbered RX channel in the standard screen; T5: Combine the third signal value and the fourth signal value to obtain the standard value.

3. The short-circuit detection method for a touchscreen channel according to claim 1, characterized in that: The specific operation of scanning through the TX channels of the screen under test in step S2 is as follows: each TX channel of the screen under test is powered on sequentially for scanning, and when there is a powered TX channel in the screen under test, all remaining TX channels are grounded.

4. The short-circuit detection method for a touchscreen channel according to claim 1, characterized in that: The methods for obtaining the first signal value or the second signal value include: Obtain the voltage value corresponding to the odd-numbered or even-numbered RX channels in the screen under test; The voltage value is converted into a digital signal value using an analog-to-digital converter.

5. The short-circuit detection method for a touchscreen channel according to claim 1, characterized in that: In step S2, when scanning through the TX channel of the screen under test, the fifth signal value corresponding to the TX channel is collected sequentially, and the first signal value, the second signal value, and the fifth signal value are merged.

6. A short-circuit detection method for a touchscreen channel according to claim 5, characterized in that: The combined value obtained by combining the first signal value, the second signal value, and the fifth signal value is verified with the standard value to determine the short-circuit channel in the screen under test.

7. A short-circuit detection method for a touchscreen channel according to claim 6, characterized in that: The specific operation for determining the short-circuit channel in the screen under test is as follows: Filter the merged values ​​to find the target fifth signal value whose difference from the standard value is greater than a preset value, and the target TX channel corresponding to the target fifth signal value; The TX channel adjacent to the target TX channel is identified as a short-circuit channel.

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