TWI384243B - Static protection device for light-on test system of liquid crystal display panel and method for the same - Google Patents

Description

Liquid crystal display panel lighting test electrostatic protection device and method

The invention relates to a lighting test device and a method for lighting test of a liquid crystal display panel, in particular to a lighting test device and method for lighting test of a liquid crystal display panel realized by a three-terminal switch unit.

Liquid crystal display panels (LCD panels) have been widely used as displays for notebook computers or mobile phones, and due to the large market demand, there are continuous research and development improvements in process and panel structure design. In order to ensure the quality of the liquid crystal display, a process of light on test (LOT) is performed in the process of the liquid crystal display panel to determine whether the pixel of the liquid crystal display panel can be normally displayed. Furthermore, in order to ensure the stability of the liquid crystal display, specific environmental test variables can be used for the aging test during the lighting test. If the LCD panel is defective, it will accelerate the aging during the aging test, and the tester can find it early and avoid dropping the product into the customer's hand.

The first figure shows a schematic diagram of a conventional lighting test system in which a light system board 10A contacts a panel test point 22A on a liquid crystal display panel 20A via a probe 12A. The panel test point 22A is an electrode terminal of the liquid crystal display panel 20A, and can be connected to a system circuit terminal via a flexible circuit board after the test to be driven by the liquid crystal display panel. However, in the lighting test system described above, since the static electricity of the lighting system board 10A also reaches the panel test point 22A via the probe 12A, there is a possibility that the internal wiring of the liquid crystal display panel 20A is disconnected. question. It may also cause damage to the circuit components of the liquid crystal display panel.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a lighting test electrostatic protection device for a liquid crystal display panel that can exclude static electricity prior to testing. Another object of the present invention is to provide a lighting test method for lighting test of a liquid crystal display panel capable of eliminating static electricity before testing.

In order to achieve the above object, the present invention provides a lighting test electrostatic protection device for a liquid crystal display panel, comprising a three-terminal switch unit and a static elimination resistor. The static electricity eliminating resistor is electrically connected between a panel test point and a ground end, and the three-terminal switch unit is operated in conjunction with a power switch of a light system board to turn the lighting system before the lighting system board is turned on. The board is grounded, and the panel test point is grounded via the static elimination resistor, thereby eliminating static electricity from the panel and the lighting system board. After the lighting system board is turned on, the three-terminal switch unit can establish an electrical connection between the lighting system board and the panel test point for testing.

In order to achieve the above object, the present invention provides a lighting test method for lighting test of a liquid crystal display panel. Before the lighting system board is turned on, the lighting system board is electrically connected to a grounding end; and one of the panel test points of the liquid crystal display panel is electrically connected to the grounding end via a static electricity removing resistor, thereby being Exclude static electricity from the panel and the lighting system board before testing.

Referring to FIG. 2, a block diagram of a lighting test electrostatic protection device for a liquid crystal display panel according to a preferred embodiment of the present invention, the electrostatic protection device 30 is applied to test a liquid crystal display panel using a lamp system board 10 (not When the panel is tested at 22, it is used for electrostatic protection. As shown in the figure, the ESD protection device 30 includes a three-terminal switch unit 32 and a static elimination resistor 34 (for example, a high resistance resistor). The three-terminal switch unit 32 includes three end points: a first end Point T1, second end point T2 and third end point T3, and can be operated in conjunction with a power switch of the lighting system board 10 (described later) to selectively electrically connect the lighting system board 10 to one Ground terminal 36 is either panel test point 22. In more detail, the first end point T1 of the three-terminal switch 32 is electrically connected to the lighting system board 10; the second end point T2 is electrically connected to the first end 34A of the static electricity eliminating resistor 34, and The pin (not shown) is electrically connected to a panel test point 22 to be detected; the third terminal T3 is electrically connected to the ground terminal 36 and the second end 34B of the static elimination resistor 34 (the ground terminal 36 and the static electricity elimination) The junction of the resistor 34). The first end point T1 and the third end point T3 form a normally-close switch to prevent the lighting system board 10 from being turned on when the lighting system board 10 is not turned on (that is, when the power switch of the lighting system board 10 is not closed) ) electrically connecting the lighting system board 10 and the grounding end 36. The first end point T1 and the second end point T2 form a normally-open switch to disconnect the lighting system board 10 and the panel test point when the lighting system board 10 is not turned on. Electrical connection between 22.

Referring to FIG. 3A and FIG. 3B, a schematic diagram of the operation of testing the electrostatic protection device using the lighting shown in FIG. 2 is illustrated. As shown in FIG. 3A, when the lighting system board 10 is not turned on (that is, when the lighting system board 10 is not closed), the lighting system board 10 and the grounding end 36 are electrically connected, so the lighting The static electricity of the system board 10 can be removed through the ground terminal 36. At this time, the panel test point 22 is electrically connected to the ground via the static elimination resistor 34. At the end 36, static electricity on the panel can also be removed to the ground terminal 36 via the static elimination resistor 34. As shown in FIG. 3B, after the lighting system board 10 is turned on (ie, when the lighting system board 10 power switch is closed), the lighting system board 10 is disconnected from the grounding terminal 36, and via the An end point T1 and the second end point T2 are electrically connected to the panel test point 22. Since the resistor 34 is a high resistance resistor, no load effect is generated and the test signal of the lighting system board 10 can be sent to the panel test point 22.

Referring to the fourth figure, a circuit diagram of a three-terminal switch unit 32 according to a preferred embodiment of the present invention, the three-terminal switch unit 32 can be, for example, a three-terminal electromagnetic relay switch, the first end The point T1 and the third end point T3 form a normally closed switch, and the first end point T1 and the second end point T2 form a normally open type switch. The power switch 12 of the lighting system board 10 is electrically connected to an electromagnet 320, and the winding configuration of the electromagnet 320 can attract the first end point T1 to contact the second end point after the electric conduction (after the power switch 12 is closed). T2, and the first endpoint T1 is disconnected from the third endpoint T3. By this circuit, the path switching operation as shown in FIG. 3A and FIG. 3B can be generated, and the static elimination effect on the front panel and the lighting system board 10 can be achieved to prevent the liquid crystal display panel from being lit during the test. The electrostatic breakdown of the system board 10.

The three-terminal switch unit 32 can also be formed by electrically connecting other three-terminal switching elements to the power switch 12 of the lighting system board 10. For example, a transistor switch or a thyristor switch can be used. The resistance value of the static electricity eliminating resistor 34 can be, for example, 50 Ω to 2 K Ω so as not to affect the normal lighting of the panel. However, those skilled in the art should be aware that different panels can be used in conjunction with the panel architecture. The electrostatic discharge resistance of the resistance is within the scope of the patent of the present invention.

In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.

[Practical Technology]

Lighting system board ‧‧10A

Probe ‧‧12A

LCD panel ‧‧20A

Panel test point ‧‧22A

【this invention】

Lighting system board ‧‧10

Panel test point ‧‧22

Electrostatic protection ‧‧30

Three-terminal switch unit ‧‧‧32

First endpoint ‧‧‧T1

Second endpoint ‧‧‧T2

Third endpoint ‧‧‧T3

Static elimination resistor ‧‧‧34

First end ‧‧ ‧A

First end ‧‧‧34B

Power switch ‧‧‧12

Electromagnet ‧‧.320

Ground terminal ‧‧‧36

The first figure shows a schematic diagram of a conventional lighting test system.

The second figure is a block diagram of a lighting test electrostatic protection device for a liquid crystal display panel according to a preferred embodiment of the present invention.

FIG. 3A and FIG. 3B are schematic diagrams showing the operation of testing the electrostatic protection device using the lighting of the liquid crystal display panel of the present invention.

The fourth figure is a circuit diagram of a three-terminal switch unit in accordance with a preferred embodiment of the present invention.

Lighting system board ‧‧10

Panel test point ‧‧22

Electrostatic protection ‧‧30

Three-terminal switch unit ‧‧‧32

First endpoint ‧‧‧T1

Second endpoint ‧‧‧T2

Third endpoint ‧‧‧T3

Static elimination resistor ‧‧‧34

First end ‧‧ ‧A

First end ‧‧‧34B

Ground terminal ‧‧‧36

Claims (4)

A liquid crystal display panel lighting test electrostatic protection device is used between a light system board and a panel test point of a liquid crystal display panel, the static protection device comprises: a static elimination resistor connected to the panel test point and a And a three-terminal switch unit having a first end point, a second end point, and a third end point; the first end point and the third end point form a normally closed switch, The first end point and the second end point form a normally open switch; the first end point is electrically connected to the lighting system board, and the second end point is electrically connected to the panel test point and the static elimination resistor One end of the third terminal is electrically connected to the other end of the static elimination resistor and the ground; wherein the three-terminal switch unit is an electromagnetic relay switch and has an electrical connection with the power switch of the lighting system board An electromagnet for electrically connecting the first end point to the second end point after the lighting system board is turned on, and disconnecting the first end point from the third end point; thereby The liquid crystal display can be displayed before the lighting system board is turned on. Electrostatic plate and the negative plates of the lighting system to the ground terminal. For example, the lighting protection device for the lighting test of the first application of the patent scope, wherein the static elimination resistance has a resistance value of 50 Ω - 2 K Ω. A liquid crystal display panel lighting test electrostatic protection method is used when a liquid crystal display panel is to be tested on a light system board, and the electrostatic protection method comprises: Before the lighting system board is turned on, the lighting system board is electrically connected to a grounding end; and a panel test point of the liquid crystal display panel is electrically connected to the grounding end via a static electricity removing resistor; After the system board is turned on, the lighting system board is disconnected from the grounding end; and the lighting system board is electrically connected to the panel test point of the liquid crystal display panel. For example, the lighting protection method for the lighting test of the third application of the patent scope is 50 Ω - 2 K Ω.