A test circuit board for a CTP screen

By adding an LED indicator circuit module to the CTP screen test circuit board and using a PNP transistor to detect the short circuit between VDD and IOVDD, the problems of large detection blind zone and poor compatibility in the existing technology are solved, realizing hardware-level visual feedback and defective product interception.

CN224518906UActive Publication Date: 2026-07-17DONG GUAN MING WAI DIAN ZI KE JI YOU XIAN GONG SI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
DONG GUAN MING WAI DIAN ZI KE JI YOU XIAN GONG SI
Filing Date
2025-07-29
Publication Date
2026-07-17

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    Figure CN224518906U_ABST
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Abstract

The utility model discloses a kind of test circuit board for CTP screen, including adapter plate, connecting plate and control circuit pin connector seat, additional LED indicating circuit module, which is connected between the VDD of test board and IOVDD detection point;The LED indicating circuit module includes PNP triode, LED lamp, resistance R1, resistance R2, resistance R3;The emitter of the PNP triode is connected VDD detection point through resistance R3 electricity;The base of the PNP triode is connected IOVDD detection point through resistance R1 electricity;The collector of the PNP triode is connected the anode of the LED lamp, the cathode of the LED lamp is grounded after passing through resistance R2.The utility model can visualize feedback welding short-circuit state, improve defective product interception rate.
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Claims

1. A test circuit board for CTP screens, comprising an adapter board, a connecting board, and a control circuit pin connector, characterized in that: An LED indicator circuit module is added, which is connected between the VDD and IOVDD detection points on the test board; The LED indicator circuit module includes a PNP transistor, an LED, resistors R1, R2, and R3; The emitter of the PNP transistor is electrically connected to the VDD detection point via resistor R3; The base of the PNP transistor is electrically connected to the IOVDD detection point via resistor R1. The collector of the PNP transistor is electrically connected to the positive terminal of the LED, and the negative terminal of the LED is grounded through resistor R2.

2. The test circuit board of claim 1, wherein, The resistance of resistor R1 is 500 to 2000 Ω.

3. The test circuit board of claim 1, wherein, The resistance of resistor R2 is 500 to 2000 Ω.

4. The test circuit board of claim 1, wherein, The resistance of resistor R3 is 0 to 500 Ω.

5. The test circuit board of claim 1, wherein, The circuit board is suitable for CTP modules of ST1633I or ST1624 control chips, including models GTF240400-0280C8, GTF7201280-0500C7, GTF480640-0240G3, GTF480640-0240H3, GTF240320-0240D5 and GTF272451-0340A0.

6. The test circuit board of claim 1, wherein, In the FPC routing layout of the adapter board, the VDD and IOVDD pins are set as non-adjacent pins.

7. The test circuit board of claim 1, wherein, In the FPC routing layout of the adapter board, the VDD and IOVDD pins are spaced more than 1mm apart.