Electrostatic discharge (ESD) protection device of liquid crystal display (LCD)

Abstract

The utility model discloses an ESD (Electro-Static Discharge) protection device of an LCD (Liquid Crystal Display). The ESD protection device comprises a metal plate, a fixed buckle, an inward turning groove, a grounding groove, an open groove and a metal elastic sheet, the metal plate is arranged on the outer side of the LCD back shell, the metal plate is provided with a fixing buckle, the LCD back shell is fixedly connected with the fixing buckle through a round hole, an inward turning groove is formed in the position, corresponding to an LCD flat cable, of the metal plate, the two edges of the inward turning groove are folded inwards, the main body part of the metal plate is further provided with an opening groove, and the opening groove is connected with the metal plate. A metal elastic piece is further arranged in the open groove, one end of the metal elastic piece is fixedly connected with the edge of the open groove, and the other end of the metal elastic piece extends out of the back of the metal plate to be connected with a machine body shell of the electronic instrument in an inserted mode. The size of the metal plate is set according to the size of the LCD, and the LCD back shell is embedded in the inner side of the metal plate, so that the shielding capability of the LCD is enhanced, and the external radiation capability of the LCD is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of LCD, in particular to an ESD protection device for LCD. Background Art

[0002] LCD (liquid crystal display) electrostatic discharge failures can be divided into sudden failures and latent failures. Among them, latent failures account for more than 90% of electrostatic failures in the application environment. This kind of failure may cause excessive stress on the circuit, thus shortening the service life;

[0003] The ESD (electrostatic discharge) protection of LCD is currently mainly achieved by setting a conductive cloth or metal mesh on the LCD panel to reduce the impact of static electricity on the LCD through voltage equalization and rapid discharge. The ESD protection level of the above-mentioned LCD can generally only reach 8KV, but now the ESD protection level of electronic instrument products using LCD is required to reach 15KV.

[0004] Existing technologies can no longer meet people’s needs at this stage. Based on the current situation, it is urgent to reform existing technologies. Utility Model Content

[0005] The purpose of the utility model is to provide an ESD protection device for LCD to solve the problems raised in the above background technology.

[0006] The utility model provides the following technical solution: an ESD protection device for LCD, comprising: sheet metal, fixing buckles, inward turning grooves, grounding grooves, opening grooves, metal springs and magnetic rings;

[0007] The sheet metal is arranged on the outside of the LCD back shell, and the sheet metal is provided with a fixing buckle, and the LCD back shell is fixedly connected to the fixing buckle by setting a circular hole, and the LCD back shell is embedded in the inner side of the sheet metal;

[0008] The sheet metal is provided with an inward-turned groove at a position corresponding to the position where the LCD cable is placed, and the inward-turned groove is used as an external interface of the LCD cable, and the LCD cable extends through the inward-turned groove to be connected to an external circuit board;

[0009] The two sides of the inwardly turned groove are folded inwardly, which can ensure that after the LCD is placed, a certain space is reserved between the sheet metal 1 and the back shell of the LCD to avoid the two being closely attached to each other and causing electrical faults;

[0010] The main body of the sheet metal is also provided with an opening slot, and a metal spring is also provided in the opening slot, one end of the metal spring is fixedly connected to the edge of the opening slot, and the other end of the metal spring extends to the back of the sheet metal and is inserted into the body shell of the electronic instrument; wherein the main body of the sheet metal is the part covered by the back shell of the LCD;

[0011] The opening grooves are provided with a plurality of opening grooves, including: a first opening groove, a second opening groove, a third opening groove and a fourth opening groove, and a metal spring is fixedly connected in each opening groove; wherein the first opening groove and the second opening groove are respectively arranged on the sides of the inverted groove, and the lower edge of the first opening groove is kept parallel to the upper edge of the inverted groove, and the upper edge of the second opening groove is kept parallel to the lower edge of the inverted groove;

[0012] The distance between the lower edge of the first opening slot and the upper edge of the second opening slot is greater than the width of the magnetic ring and smaller than the width of the inverted slot.

[0013] The sheet metal is also provided with a third opening groove and a fourth opening groove, the positions of which are set according to the size and weight of the LCD and the magnetic ring, and the third opening groove and the fourth opening groove are connected to the body shell of the electronic instrument through metal springs, thereby increasing the overall stability of the sheet metal.

[0014] The LCD cable is connected to the external ARM through a series connection resistor, which reduces the power output and the degree of outward radiation.

[0015] The utility model has the following beneficial effects:

[0016] (1) The utility model sets the size of the sheet metal according to the size of the LCD, and by embedding the LCD back shell inside the sheet metal, the shielding ability of the LCD is enhanced and its external radiation ability is reduced.

[0017] (2) The utility model provides a metal spring on the main body of the sheet metal, which extends outward from the back of the sheet metal and is inserted into the body shell of the electronic instrument to connect with the sheet metal, thereby making the connection between the sheet metal and the body of the instrument more stable.

[0018] (3) The cable jacket of the LCD of the utility model is provided with a magnetic ring, and the cable is also connected to the external ARM through a series connection resistor, which improves the ESD protection capability of the LCD by reducing the degree of outward radiation. At the same time, the ESD level of the entire electronic instrument with the LCD of the present technical solution is enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front structure of the sheet metal of the utility model;

[0020] Figure 2 This is a schematic diagram of the back structure of the sheet metal of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the opening slot and the metal spring of the utility model;

[0022] Figure 4It is a schematic diagram of the LCD cable connecting the magnetic ring and the resistor of the utility model. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. All other embodiments obtained by ordinary technicians in the field of the utility model without creative work are within the scope of protection of the utility model.

[0024] refer to Figure 1 , Figure 2 and Figure 3 The utility model provides the following technical solution: an ESD protection device for LCD, comprising: a sheet metal 1, a fixing buckle 2, an inverted groove 3, a grounding groove 4, an opening groove 5, a metal spring 6, and a magnetic ring 7;

[0025] The sheet metal 1 is arranged on the outside of the LCD back shell, and a fixing buckle 2 is arranged on the side of the sheet metal 1. The LCD back shell is fixedly connected to the fixing buckle 2 by setting a circular hole. The overall shape of the sheet metal 1 is a rectangular groove, and the size of the sheet metal 1 is set according to the size of the LCD. Generally, the inner size of the rectangular groove is equal to the size of the LCD back shell. Therefore, by embedding the LCD back shell inside the sheet metal 1, the shielding ability of the LCD is enhanced and the external radiation ability is reduced;

[0026] The sheet metal 1 is provided with an inward groove 3 at a position corresponding to the LCD cable. The inward groove 3 is used as an external interface of the LCD cable. The LCD cable extends through the inward groove 3 and is connected to an external circuit board. The LCD cable is covered with a magnetic ring 7, which improves the ESD protection capability of the LCD.

[0027] The two sides of the inwardly turned groove 3 are folded inwardly, which can ensure that after the LCD is placed, a certain space is reserved between the sheet metal 1 and the back shell of the LCD to avoid the two being closely attached to each other and causing electrical faults;

[0028] The sheet metal 1 is also provided with a grounding groove 4, which is arranged on the sheet metal 1 according to the position of the grounding terminal of the LCD. The LCD grounding terminal directly extends from the grounding groove 4 and is connected to the outer grounding terminal, which is more flexible to use.

[0029] The main body of the sheet metal (the part covered by the LCD back shell) is also provided with an opening groove 5, and a metal spring 6 is also provided in the opening groove 5. One end of the metal spring 6 is fixedly connected to the edge of the opening groove 5, and the other end of the metal spring 6 extends to the back of the sheet metal 1 and is inserted into the body shell of the electronic instrument.

[0030] The opening slots 5 are provided with a plurality of them. In the present embodiment, the opening slots 5 include: a first opening slot 501, a second opening slot 502, a third opening slot 503 and a fourth opening slot 504, and a metal spring 6 is fixedly connected in each opening slot 5; wherein the first opening slot 501 and the second opening slot 502 are respectively arranged on the sides of the inverted slot 4, and the lower edge of the first opening slot 501 is parallel to the upper edge of the inverted slot 4, and the upper edge of the second opening slot 502 is parallel to the lower edge of the inverted slot 4; in the present embodiment, such a structural arrangement is determined according to the width of the cable, and the magnetic ring 7 is arranged in the first opening slot 50 1 and the upper edge of the second opening groove 502, so the distance between the lower edge of the first opening groove 501 and the upper edge of the second opening groove 502 needs to be greater than the width of the magnetic ring 7. Furthermore, since the width of the LCD cable is at most equal to the width of the inward-turned groove 3, the distance between the lower edge of the first opening groove 501 and the upper edge of the second opening groove 502 needs to be smaller than the width of the inward-turned groove 3, and the lower edge of the first opening groove 501 and the second opening groove 502 are respectively arranged on both sides of the magnetic ring, and are more stable after being inserted and connected with the body shell of the electronic instrument through the metal spring pieces 6 in the first opening groove 501 and the second opening groove 502.

[0031] In this embodiment, the position and number of the metal spring pieces 6 can be set according to the size and weight of the LCD and the magnetic ring 7. In this embodiment, a third opening groove 503 and a fourth opening groove 504 are provided at other positions of the sheet metal 1. The third opening groove 503 and the fourth opening groove 504 are used to connect the body casing of the electronic instrument through the metal spring piece 6 to increase the overall stability of the sheet metal.

[0032] refer to Figure 4 In this embodiment, in order to improve the ESD level of the instrument with the LCD as a whole, the LCD cable is also connected to the external ARM through a series connection resistor to reduce power output and reduce the degree of outward radiation.

[0033] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ESD protection device for LCD, characterized in that: include: Sheet metal (1), fixing buckle (2), inward turning groove (3), grounding groove (4), opening groove (5), metal spring (6) and magnetic ring (7); The sheet metal (1) is arranged on the outer side of the LCD back shell, and the sheet metal (1) is provided with a fixing buckle (2), and the LCD back shell is fixedly connected to the fixing buckle (2) by providing a circular hole, and the LCD back shell is embedded in the inner side of the sheet metal (1); The sheet metal (1) is provided with an inward-turned groove (3) at a position corresponding to the position where the LCD cable is placed. The inward-turned groove (3) is used as an external interface of the LCD cable. The LCD cable extends through the inward-turned groove (3) to be connected to an external circuit board. The main body of the sheet metal is also provided with an opening groove (5), and a metal spring (6) is also provided in the opening groove (5), one end of the metal spring (6) is fixedly connected to the edge of the opening groove (5), and the other end of the metal spring (6) extends to the back of the sheet metal (1) and is inserted into the body shell of the electronic device; wherein the main body of the sheet metal is the part covered by the back shell of the LCD; The opening grooves (5) are provided with a plurality of opening grooves (5), and the opening grooves (5) include: a first opening groove (501), a second opening groove (502), a third opening groove (503) and a fourth opening groove (504), and a metal spring (6) is fixedly connected in each opening groove (5); wherein the first opening groove (501) and the second opening groove (502) are respectively arranged on the sides of the inverted groove (3), and the lower edge of the first opening groove (501) is kept parallel to the upper edge of the inverted groove (3), and the upper edge of the second opening groove (502) is kept parallel to the lower edge of the inverted groove (3); The LCD cable is connected to the external ARM through a series connection resistor to reduce power output and reduce the degree of outward radiation.

2. The LCD ESD protection device according to claim 1, characterized in that: The overall shape of the sheet metal is a rectangular groove, and the inner size of the rectangular groove is equal to the size of the LCD back shell.

3. The LCD ESD protection device according to claim 1, characterized in that: The two sides of the inwardly turned groove (3) are folded inwardly, so that after the LCD is placed, a space is reserved between the sheet metal (1) and the back shell of the LCD, thereby preventing the two from being closely fitted together and causing electrical faults.

4. The LCD ESD protection device according to claim 1, characterized in that: The sheet metal (1) is also provided with a grounding groove (4) at the position of the LCD grounding end, and the LCD grounding end directly extends from the grounding groove (4) and is connected to an outer grounding terminal.

5. The LCD ESD protection device according to claim 1, characterized in that: While ensuring that the lower edge of the first opening groove (501) and the upper edge of the second opening groove (502) are respectively parallel to the upper edge and lower edge of the inward-turned groove (3), the distance between the lower edge of the first opening groove (501) and the upper edge of the second opening groove (502) is related to the width of the wiring.

6. The LCD ESD protection device according to claim 1, characterized in that: The LCD cable jacket is provided with a magnetic ring (7), which is arranged between the lower edge of the first opening groove (501) and the upper edge of the second opening groove (502).

7. The LCD ESD protection device according to claim 1, characterized in that: The distance between the lower edge of the first opening groove (501) and the upper edge of the second opening groove (502) is greater than the width of the magnetic ring (7) and less than the width of the inverted groove (3).

8. The LCD ESD protection device according to claim 1, characterized in that: The sheet metal (1) is also provided with a third opening groove (503) and a fourth opening groove (504), the positions of which are set according to the size and weight of the LCD and the magnetic ring, and the third opening groove (503) and the fourth opening groove (504) are connected to the body shell of the electronic instrument through the metal spring (6) to increase the overall stability of the sheet metal.

Images