Display module GOA circuit protection devices and methods for protection against impact damage
By combining a 1kΩ current-limiting resistor with a 1MΩ discharge resistor, the problem of ESD-induced GOA circuit burn-out in LCD module production was solved, achieving slow electrostatic discharge and improving production yield and product reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GANZHOU TXO TECH CO LTD
- Filing Date
- 2026-05-22
- Publication Date
- 2026-07-31
AI Technical Summary
During the production of LCD modules, the instantaneous release of ESD static electricity can cause GOA circuit burns. Existing technologies lack effective static discharge mechanisms, which affects product yield and production efficiency.
A combination of a 1kΩ current-limiting resistor and a 1MΩ discharge resistor is used, and the switching switch is controlled by the control circuit unit to achieve slow discharge of static electricity and avoid large current impact on the GOA circuit.
It effectively avoids ESD burns, significantly improves module production yield and product reliability, has strong adaptability, is easy to integrate into existing test fixtures, and does not affect production cycle.
Smart Images
Figure CN122493794A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of display module technology, and in particular to a protective device and method for protecting the GOA circuit of a display module from impact damage. Background Technology
[0002] During the production of LCD modules, testing is required. When the existing CT1 test fixture connects to the test points of the LCD module's CT circuitry via probes, the accumulated ESD within the LCD module is instantly released, creating a large current surge that impacts the GOA (Gate on Array) circuitry. This can cause circuit burn-in, abnormal module display, and other problems, severely impacting product yield and production efficiency. Currently, there is a lack of effective electrostatic discharge mechanisms, making it impossible to fully release the internal static electricity of the LCD module before testing, thus failing to fundamentally prevent ESD damage to the GOA circuitry.
[0003] Therefore, existing technologies have shortcomings and need to be improved. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a protective device and method for protecting the GOA circuit of a display module from impact damage.
[0005] The technical solution of the present invention is as follows: The present invention provides a protective device for GOA circuit protection of a display module, comprising: a switching switch, a control circuit unit, several current-limiting resistors and several discharge resistors. The switching switch includes several sets of switching units. The first end of the switching unit is electrically connected to one end of the current-limiting resistor, and the other end of the current-limiting resistor is used to electrically connect to the display module under test. The second end of the switching unit is electrically connected to the signal terminal of the test motherboard. The third end of the switching unit is electrically connected to one end of the discharge resistor, and the other end of the discharge resistor is grounded. The control circuit unit is electrically connected to the switching switch. The control circuit unit is used to switch the first end of all the switching units to be connected to the second end or the first end to the third end under the control of a control signal.
[0006] Furthermore, the other end of the current-limiting resistor is connected to a probe, which is electrically connected to the signal line of the electronic device under test.
[0007] Furthermore, the resistance of the current-limiting resistor is 1KΩ to 2KΩ. If the resistance is too small, the current-limiting effect will not be achieved, and if it is too large, the signal timing waveform will be abnormal.
[0008] Furthermore, the resistance of the discharge resistor is 1MΩ.
[0009] Furthermore, the control circuit unit includes a switching transistor, the control terminal of which is electrically connected to the control signal terminal of the test equipment, and the switching transistor is used to control the switching unit to switch.
[0010] Furthermore, the switching switch includes two sets of switching units.
[0011] Furthermore, the switching switch is a relay.
[0012] The present invention also provides a protection method, comprising the following steps: Step 1: Provide the above-mentioned protective device for GOA circuit of the display module to prevent damage from impact, and electrically connect the other end of the current limiting resistor to the test circuit of the display module under test through a probe.
[0013] Step 2: Discharge the static electricity of the display module under test through the current-limiting resistor and the discharge resistor path.
[0014] Step 3: After the electrostatic discharge has been completed for the predetermined time, a control signal is sent to the control circuit unit to switch the state of the switching unit from connecting the first terminal to the third terminal to connecting the first terminal to the second terminal, and the display module under test is then subjected to the normal power-on test process.
[0015] Furthermore, in step 3, the predetermined time is 2 seconds.
[0016] The beneficial effects of this invention using the above solution are as follows: By combining a 1kΩ current-limiting resistor and a 1MΩ discharge resistor, static electricity is slowly discharged, preventing large current surges into the GOA circuit and fundamentally solving the ESD burn problem. This significantly improves wafer breakage efficiency and meets production requirements. Simulation and field verification have shown that ESD defects in the GOA circuit, such as horizontal defects at the top of the LCD, can be completely eliminated, significantly improving module production yield and product reliability. The device can be directly integrated into existing CT1 test fixtures without major modifications to the production line, exhibiting strong adaptability and ease of application. The 2-second delay discharge function and automatic signal switching mechanism require no additional operation, do not affect production cycle time, and ensure operational efficiency. Attached Figure Description
[0017] Figure 1 This is a structural block diagram of a protective device according to an embodiment of the present invention. Detailed Implementation
[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0019] Please refer to the following: Figure 1In this embodiment, the present invention provides a protective device for preventing damage to the GOA circuit of a display module, comprising: a switching switch T1, a control circuit unit, two current-limiting resistors R1 and R3, and two discharge resistors R2 and R4. The switching unit T1 includes two sets of switching units. The first end of the first set of switching units is electrically connected to one end of the current-limiting resistor R1, and the other end of the current-limiting resistor R1 is connected to probe A. Probe A is electrically connected to the CT PAD point of the display module under test. The second end of the first set of switching units is electrically connected to the signal A terminal of the test motherboard. The third end of the first set of switching units is electrically connected to one end of the discharge resistor R2, and the other end of the discharge resistor R2 is grounded. The first end of the second set of switching units is electrically connected to one end of the current-limiting resistor R3, and the other end of the current-limiting resistor R3 is connected to probe B. Probe B is electrically connected to the CT PAD point of the display module under test. The second end of the second set of switching units is electrically connected to the signal B terminal of the test motherboard. The third end of the second set of switching units is electrically connected to one end of the discharge resistor R4, and the other end of the discharge resistor R4 is grounded. The control circuit unit is electrically connected to the switching unit T1. The control circuit unit is used to synchronously switch the first set of switching units and the second set of switching units to either the first end being connected to the second end or the first end being connected to the third end under the control of the control signal JDQ1. In this embodiment, the switching switch is a G6K-2G relay.
[0020] Specifically, in this embodiment, the current limiting resistors R1 and R3 are both 1KΩ, the current limiting resistors R1 and R2 are integrated on the resistor board, the discharge resistors R2 and R4 are 1MΩ, and the switching switch T1, the discharge resistors R2 and R4 and the control circuit unit are integrated on the discharge board.
[0021] Specifically, the control circuit unit includes a switching transistor Q1. The control terminal of the switching transistor Q1 is electrically connected to the control signal terminal of the test equipment through a resistor R5, so that the test equipment can control the switching unit to switch through the switching transistor Q1.
[0022] Please continue reading. Figure 1The operating procedure of the protective device in this solution is as follows: Power on the protective device. At this time, both sets of switching units are connected at the first and third terminals, and are in the discharge channel. Probes A and B contact the CT PAD point of the LCD module under test. The internal static electricity of the LCD module under test is released through probes A and B, current-limiting resistors R1 and R3, discharge resistors R2 and R4, and the ground terminal. After the static electricity is released, a signal is sent to the switching transistor Q1 to control the switching switch T1, allowing both sets of switching units to switch to the first and second terminal connections. At this time, probes A and B are electrically connected to the corresponding test motherboard signal A and test motherboard signal B terminals, respectively, allowing the display module under test to be powered on normally and complete the module performance test. The combination of a 1kΩ current-limiting resistor and a 1MΩ discharge resistor achieves slow static discharge, avoiding large current surges to the GOA circuit and fundamentally solving the ESD burn problem.
[0023] The present invention also provides a protection method, comprising the following steps: Step 1: Provide the above-mentioned protective device for the GOA circuit of the display module to prevent damage from impact. Power on the protective device and electrically connect the current limiting resistors R1 and R3 to the CT PAD point of the display module under test through probes A and B, respectively.
[0024] Step 2: Discharge the static electricity of the display module under test through the current-limiting resistors R1 and R3 and the discharge resistors R2 and R4.
[0025] Step 3: After 2 seconds of electrostatic discharge, a control signal is sent to the control circuit unit to switch the state of both sets of switching units from the connection between the first and third ends to the connection between the first and second ends, and to perform the normal power-on test process on the display module under test.
[0026] In summary, the beneficial effects of this solution are as follows: By combining a 1kΩ current-limiting resistor and a 1MΩ discharge resistor, slow static discharge is achieved, preventing high-current impacts on the GOA circuit and fundamentally solving the ESD burn problem. This significantly improves wafer breakage efficiency and meets production requirements. Simulation and field verification have completely eliminated ESD defects in the GOA circuit, such as horizontal defects at the top of the LCD, significantly improving module production yield and product reliability. The device can be directly integrated into existing CT1 test fixtures without significant production line modifications, demonstrating strong adaptability and ease of application. The 2-second delay discharge function and automatic signal switching mechanism require no additional operation, do not affect production cycle time, and ensure operational efficiency.
[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A display module GOA circuit anti-striking protection device, characterized in that, include: The system includes a switching switch, a control circuit unit, several current-limiting resistors, and several discharge resistors. The switching switch comprises several sets of switching units. The first end of each switching unit is electrically connected to one end of a current-limiting resistor, and the other end of the current-limiting resistor is electrically connected to a display module under test. The second end of each switching unit is electrically connected to a signal terminal of a test motherboard. The third end of each switching unit is electrically connected to one end of a discharge resistor, and the other end of the discharge resistor is grounded. The control circuit unit is electrically connected to the switching switch and is used to switch the connection between the first and second ends or between the first and third ends of all the switching units under the control of a control signal.
2. The display module GOA line strike-proof protection device according to claim 1, wherein, The other end of the current-limiting resistor is connected to a probe, which is electrically connected to the signal line of the electronic device under test.
3. The display module GOA line anti-injury protection device according to claim 1, characterized in that, Its features are, The resistance of the current-limiting resistor is 1KΩ to 2KΩ.
4. The display module GOA line strike injury prevention device of claim 1, wherein, The resistance of the discharge resistor is 1MΩ.
5. The display module GOA line strike injury prevention device of claim 1, wherein, The control circuit unit includes a switching transistor, the control terminal of which is electrically connected to the control signal terminal of the test equipment, and the switching transistor is used to control the switching unit to switch.
6. The protective device for protecting the GOA circuit of a display module from impact damage according to any one of claims 1 to 3, characterized in that, The switching switch includes several sets of switching units.
7. The protective device for protecting the GOA circuit of a display module from impact damage according to any one of claims 1 to 3, characterized in that, The switch is a relay.
8. A protection method, characterized in that, Includes the following steps: Step 1. Provide a protective device for GOA circuit protection of display module as described in any one of claims 1 to 7, wherein the other end of the current limiting resistor is electrically connected to the test circuit of the display module under test through a probe; Step 2. Discharge static electricity from the display module under test through the current limiting resistor and the discharge resistor path; Step 3. After the static electricity is discharged for a predetermined time, send a control signal to the control circuit unit to switch the state of the switching unit from the connection between the first end and the third end to the connection between the first end and the second end, and perform a normal power-on test process on the display module under test.
9. The protection method according to claim 8, characterized in that, In step 3, the predetermined time is 2 seconds.