TWI231159B - Electrostatic discharge protection ciruit of LCD panel - Google Patents

Abstract

This invention relates to an electrostatic discharge protection circuit, particularly a protection circuit used in LCD panel. It can prevent the damage of driving circuit due to electrostatic discharge (ESD) effect. Mainly, the ending terminal of each driving circuit on the display panel has a tip part formed, and the panel edge side corresponding to the tip part has at least a discharge electrode. The ending terminal of the discharging electrode also has a tip part of discharging electrode corresponding to the tip part of each driving circuit. Thus, when the driving circuit has static charges, the tip part releases the static charges to the corresponding discharging electrode. It prevents the driving circuit and the connected electronic components from being damaged by the sudden large current. It not only simplifies the manufacturing process, but also saves the cost.

Description

1231159 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to an electrostatic protection circuit, in particular to a protection circuit that can be used on a liquid crystal display panel to prevent the driving circuit from being damaged due to the electrostatic charge discharge effect. . [Previous technology] The TFT film LCD has become a mainstream product in the display market due to its small size, light weight, and high resolution. The thin film transistor liquid crystal display is mainly composed of a thin film layer such as a backlight plate, a thin film transistor panel (hereinafter referred to as a panel), a liquid crystal, a color filter, and a polarizing plate. The static electricity is usually produced statically. The electric power reached at the instant of driving is released after several consecutive times, and the drive circuit is discharged by thousands of volts. During the process of manufacturing the circuit of the sub-element color ultra-thin film transistor panel, cleaning, Filming, coating photoresist, exposure, development, and etching to form thin-film transistors (Thin-fUm Transist 00, Jata Bus Line) and Gate Bus (Gate Bus), the line width of this driver circuit and The distance between them is extremely fine, and the thickness is one meter (// m), or even smaller. After completion, the coating film and its dried product are coated. ': = Wipe: make the completed driving circuit extremely fine' Will make the accumulated static electricity 4 u shell injury, seriously affect the production yield. Phase;

Page 5 of 1231159 V. Description of the invention (2) Twisted nematic liquid crystal display (Color STN LCD) manufacturing, because the static electricity generated during the manufacturing process can also affect product quality and production yield, how to avoid electrostatic discharge Effect, and to maintain the driving circuit and the electronic components connected to it, is an important issue for manufacturers of thin film transistors, twisted nematic liquid crystal displays and super twisted nematic liquid crystal display panels. Please refer to Figure 1, which is a schematic diagram of the structure of a conventional thin-film transistor panel to prevent electrostatic discharge from damaging the driving circuit. As shown in the figure, a panel 丨 0 is provided with a plurality of driving circuits, such as data bus lines 丨 丨 and gate bus Cables 1 3. In order to prevent electrostatic charges from accumulating on the driving circuit during the manufacturing process, which may cause damage to the circuits that may be formed by adjacent driving circuits or transistors, a lateral guide is provided on the panel edge invalid area 5 on the side of the panel 10 The lead 151 and the vertical guide line 153 are connected in series with a current-limiting resistor 155 to the horizontal guide line 151 and the vertical guide line 丨 53, and each data bus 丨 丨 'can be electrically connected in the horizontal direction Guide lines 151, and each gate bus line 13 is electrically connected to the longitudinal guide line 153, so that the electrostatic charges accumulated by each data bus line and the gate bus line 3 can be guided out. , And make 苴 = equal, which can prevent the spleen and ash due to the circuit damage caused by the electrostatic discharge effect. Although the various processes are completed, they can be cut along the cutting lines 1 71, 1 73 :, and the edge invalid area 15 to go. Alas, this completes the line process. Although the electrostatic method can effectively guide the driving circuits or transistors: electricity can be used to protect the driving circuit and ... but this method must be formed with a lateral guide wire (5) and

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In addition, the cutting process must be performed to remove the edge of the board. This is not only to increase the trouble in the manufacturing process, but also to longitudinally guide the line 1 5 3, and subsequently 15 parts of the effective area must be removed. There will also be a waste of resources. [Summary of the Invention]

It is the key point of the present invention to reduce the production process and reduce the production cost. The connected electronic components can also be simplified. Is the main object of the present invention, which is to provide an electrostatic protection circuit, which can utilize at least one discharge electrode on the ineffective area of the side of the panel, and each terminal of the P pole is formed with a terminal that can be connected to the body circuit terminal. The corresponding electrode tip portion causes the electrostatic charge possessed by the driving circuit on the panel to be released through the discharge electrode, avoiding the formation of instantaneous large currents that could damage the driving circuit and the electronic components electrically connected thereto. A secondary object of the present invention is to provide an electrostatic protection circuit, which can be used to discharge a discharge electrode of an electrostatic charge and does not need to be removed in a later stage process. Therefore, a cutting process can be relatively simplified. Another object of the present invention is to provide an ESD protection circuit to reduce the production cost through a simple process. Another object of the present invention is to provide an electrostatic protection circuit. The ineffective area on the edge of the board does not need to be removed. Therefore, the waste of resources can be reduced. In order to achieve the above purpose, the present invention provides a 1231159 LCD panel.

V. Description of the invention (4) The electrostatic protection circuit requires the power of the sun to be protected, and there is a plurality of saws on the front panel of the theft panel. At least the terminal position of the driving circuit of the circuit is formed. Ί, ί : The side of the panel corresponding to the tip portion is provided with at least -discharge Ϊ:: = ΓΓ causes the static electricity (丄) of the driving circuit and the electrode tip portion to be discharged to the discharge electrode. [Embodiment] To make the review committee understand and recognize the features of the present invention, the structure and the effectiveness of the invention, I would like to provide a better implementation diagram with detailed description, as follows: First, please refer to FIG. 2, which is a schematic structural diagram of a preferred embodiment of the present invention. As shown in the figure, the electrostatic protection circuit of the liquid crystal display panel of the present invention is mainly distinguished on a panel 20 by a panel edge invalid area 251 and a center. Line area 253; Among them, the central line area 253 is an effective visual area in actual use. It is also provided with a plurality of driving circuits, which include a data bus 21 and a gate bus 23, and a data bus. The bus line 21 and the gate bus line 23 can be respectively connected with at least one electronic component, such as a thin film transistor and a capacitor (not shown), for driving the direction of the liquid crystal molecules. In addition, each data bus 21 and gate bus 23 may be individually formed with a first tip portion 211 or a second tip portion 231 at the terminal position of the plate edge invalid area 251. The plate on the side of the panel 10 In the edge invalid area 251, at least one first busbar corresponding to each of the data busbar 21 and the gate busbar 23 is respectively provided.

1231159 V. Description of the invention (5) --- A discharge electrode 27 or a second discharge electrode 29, and a first electrode tip portion 271 is formed at the terminal position of the first discharge electrode 27, and the first electrode tip portion 271 is adjacent to the data The first tip portions 2n of the bus bars 21 face each other. Similarly, a second electrode tip portion 291 is also formed at the terminal position of the second discharge electrode 29. The second electrode tip portion 291 is adjacent to the second tip portion 2 31 of the gate bus bar 23 and faces each other. When the gate bus bar 23 is locally charged with static electricity due to friction or other reasons, the electrostatic charge can be slowly discharged through the second tip portion 2 31 of the gate bus bar 23 to the corresponding one. The two-electrode tip 2 gj and the second discharge electrode 29 are used to prevent the gate busbars 2 3 from being charged to a certain extent due to electrostatic charges. The cable 21 or an electronic component electrically connected thereto is used to protect the driving circuit. Of course, when the gate bus bar 23 is discharged through the second tip portion 231 to the corresponding second electrode tip portion 291 and the second discharge electrode 29, the second tip portion 231 and the second electrode tip portion may also be caused accordingly. 291 or the second discharge electrode 29, but this damage area is only limited to the adjacent area of the second tip portion 23 1 and the corresponding second discharge electrode 29, and this area can be designed in the panel edge invalid area 2 of the panel side Within 51, the electronic components and driving circuits in the central circuit area 253 will not be damaged, so it will not affect the visual effect of the user at all. In the same way, the discharge effect and effectiveness of the data bus 21 are the same, so I will not repeat them here. In the present invention, the first tip portion 211, the first discharge electrode 27, the first electrode tip portion 271, and the second tip which may be damaged by the electrostatic discharge effect

Page 9 of 1231159 V. Description of the invention (6) The part 231, the second discharge electrode 29 and the second electrode tip portion 291 are fixed in the invalid area 251 of the board edge which does not affect the visual effect of the user, and the first tip portion 2Π and There is no direct contact between the first electrode tip portion 271 and the second tip portion 231 and the second electrode dachi portion 2 91. Therefore, it is not necessary to perform a board edge ineffective area after the panel driving circuit is completed. The cutting procedures of 251 and central line area 253 can not only simplify the production process, but also reduce the waste of resources and save the cost. Finally, please refer to FIG. 3, which is a schematic structural diagram of another embodiment of the present invention. As shown in the figure, each of the second discharge electrodes 29 is connected in series by a second discharge circuit 313, and Each first discharge electrode 27 is connected in series by a first discharge circuit 3 11. In addition, the first discharge circuit 311 and the second discharge circuit 313 are electrically connected by a current limiting resistor 315. That is, the entire discharge circuit can be at the same potential, and the discharge balancing effect can be enhanced. Of course, how many second tip portions 231 ′ are provided for each gate bus bar 23 or how many second electrode tip portions 2 91 are provided for each second discharge electrode 29 can be passed through the materials and lines used. The arrangement, the size of the panel, etc. can be calculated and designed without limiting the number. Similarly, the number of the first tip portions 211 of the data bus bar 21 and the number of the first electrode tip portions 271 of the first discharge electrode 27 may be set to different numbers according to actual needs. In addition, this kind of electrostatic protection circuit can also be provided only on the bus bar 23 of the idler, or only on the bus bar 21 of the data. In addition, such an electrostatic protection circuit can be applied not only to a thin film liquid crystal display (TFT-LCD), but also to a twisted nematic liquid crystal display and a super twisted

Page 10 1231159 V. Description of the invention (7) The nematic liquid crystal display and other static electricity losses may occur. In particular, it is an electric charge process, and it is undoubtedly progressive. The shape should include the description, when it can be used for the hydroelectric effect and can save costs, and can be patented in accordance with the law, the invention, the solid state, the structure of the present invention is based on the present invention to prevent damage to the crystal display. The industry's use of real patents for invention patents is only for the scope, features, and applications of this invention, which are specifically related to a panel that can protect circuits, not only. Therefore, those who have actual effect of the present invention should comply with the application, and urge one of them to be better, that is, within the scope of the average benefit of the spirit of the present invention. Injured liquid crystal display ESD protection circuit, two drive circuits due to static: to simplify the production, as a novelty, combined with patent application requirements, your review committee just said the example, not the changes and modifications of the patent application scope, etc.

Page 11 1231159 V. Description of the invention (8) Drawing number comparison description: 10 Panel 11 Data bus line 13 Gate bus line 15 Invalid board edge 1¾ 151 Horizontal guide line 153 Vertical guide line 155 Current limiting resistor 171 Cutting Line 173 cutting line 20 panel 21 data bus line 211 first tip portion 23 gate bus line 231 second tip portion 251 plate edge invalid area 253 central line 27 first discharge electrode 271 first-electrode tip portion 29 second Discharge electrode 291 Second electrode tip portion 311 First discharge circuit 313 Second discharge circuit 315 Current limiting resistor

Page 1231159 Brief description of the diagram. Figure 1: Schematic diagram of a conventional thin-film transistor panel to prevent electrostatic discharge damage to the drive circuit. Figure 2: Schematic diagram of a preferred embodiment of the present invention; and Figure 3: Schematic diagram of the structure of another embodiment of the present invention.

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Claims (1)

1231159 6. Scope of patent application1. An electrostatic protection circuit for a liquid crystal display panel is mainly provided with at least one data bus line on a display panel, and at least one first tip portion is formed at a terminal position of each data bus line. And at least one first discharge electrode is provided on the side of the panel corresponding to the first tip portion, and at least one first electrode tip immediately adjacent to the first tip portion is formed at a terminal position of each first discharge electrode The electrostatic charge of the data bus bar can be discharged to the first discharge electrode by the first tip portion and the first electrode tip portion. 2 · The electrostatic protection circuit according to item 1 of the scope of the patent application, wherein the display panel is further provided with at least one gate bus, and at least one second tip portion is formed at a terminal position of each gate bus, At least one second discharge electrode is provided on a side of the panel corresponding to the second tip portion, and at least one second electrode tip portion adjacent to the second tip portion is formed at a terminal position of each second discharge electrode. So that the electrostatic charge of the gate bus bar can be discharged to the second discharge electrode through the second tip portion and the first electrode tip portion. 3 · The electrostatic protection circuit as described in item 2 of the scope of the patent application, wherein the display panel includes at least a plate edge invalid area and a central line area. The distant data bus line and the gate bus line are fixed in the center. The first tip portion, the second tip portion, the first discharge electrode, the second electrode large end portion, the first discharge electrode, and the second electrode tip portion are fixed in the circuit edge invalid area. 4 · The electrostatic protection circuit according to item 2 of the scope of patent application, wherein each first discharge electrode can be obtained by at least one first discharge circuit 7 8 9 10 1231159 VI. The scope of the patent application is electrically connected to each other, and each second visits a second discharge circuit to be electrically connected to each other. At least 5 between the poles. · As described in item 4 of the scope of patent application Connected. The first discharge circuit and the second discharge circuit are two: a protection circuit, wherein the current limiting resistor. At least one 6 can be provided between them. · As described in item 1 of the scope of the patent application, it can be used in thin film liquid crystal displays, twisted π electricity, which is one of the optional super twisted nematic liquid crystal displays. And: A type of LCD display panel is provided with a plurality of drivers on the electrostatic protection display panel. At least one terminal is formed at the end position of the road. At least one discharge electrode core is provided at the side of the panel :: Tip dt: 置Formed with at least one electrode tip close to the tip part and the central end of the electrode to be discharged to the discharge: by the electrostatic anti-drive described in § 19 as described in item 7 of the patent scope, the circuit system can optionally include There is at least one data bus or one of its combinations. ㈣Xiangji, as described in item 7 of the scope of the patent application, shows that the panel system includes at least -invalid area of the board edge and -middle area; the area ... the electrical circuit is fixed in the central line area β, and the tip, The discharge electrode and the electrode tip are fixed in the invalid area on the edge of the board. For example, in the electrostatic protection circuit described in item 7 of the scope of the patent application, one discharge electrode can be mutually connected by at least one discharge circuit. Page 15 1231159 6. Application for patent scope connection. 11 · The electrostatic protection circuit according to item 10 of the scope of patent application, wherein at least one current-limiting resistor may be provided between the discharge lines. 1 2 · The electrostatic protection circuit described in item 7 of the scope of patent application can be used in one of thin film liquid crystal display, twisted nematic liquid crystal display and super twisted nematic liquid crystal display. Page 16