Main screen circuit board with adjustable resistor and liquid crystal display module

Abstract

The utility model discloses a main screen circuit board with an adjustable resistor, which comprises a circuit board body, the circuit board body is provided with a peripheral driving circuit used for driving a liquid crystal panel, the peripheral driving circuit comprises the adjustable resistor, the adjustable resistor comprises an adjusting part, a coating adhesive layer is arranged outside the adjustable resistor, and the coating adhesive layer is arranged on the circuit board body. And the coating adhesive layer wraps and covers the adjustable resistor and is bonded and fixed with the circuit board body. The main screen circuit board is provided with an adjustable resistor, and the resistance value of the adjustable resistor does not deviate after adjustment is completed. The utility model further discloses a liquid crystal display module which comprises the main screen circuit board.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technology especially, relate to a main screen circuit board and liquid crystal display module. BACKGROUND

[0002] The peripheral drive circuit of liquid crystal display module often uses adjustable resistance, for adjusting the contrast or flicker problem of display screen.

[0003] For example, the Chinese patent with the application number CN202121707149.5 discloses a touch display driving compensation circuit, comprising: Vcom voltage dividing circuit, the Vcom voltage dividing circuit is connected between power input and ground, the Vcom voltage dividing circuit includes Vcom output end;Comparison operation circuit, the first end of the comparison operation circuit is used for inputting the scanning collection feedback voltage of touch module, the second end of the comparison operation circuit is used for inputting Vcom voltage design value, the output end of the comparison operation circuit is used for outputting differential voltage;Voltage peripheral drive circuit, one end of the voltage peripheral drive circuit is connected with the output end of comparison operation circuit, and the other end is connected with Vcom voltage dividing circuit;The Vcom voltage dividing circuit includes resistance R2, adjustable resistance VR and capacitor C0;The first end of the resistance R2 is grounded, the second end of the resistance R2 is connected with the first end of adjustable resistance VR, and the second end of the adjustable resistance VR is connected with Vcom output end;The first end of the capacitor C0 is grounded, and the second end of the capacitor C0 is connected with Vcom output end.

[0004] However, in the production and transportation process, the adjustment knob on the adjustable resistance may be touched by foreign matter, so that it is twisted, so that the resistance value deviates after completing adjustment, thereby affecting the display effect. INVENTION CONTENTS

[0005] In order to solve the above-mentioned deficiencies of prior art, the utility model provides a main screen circuit board, which has adjustable resistance, and the resistance value of the adjustable resistance does not deviate after completing adjustment

[0006] The utility model also provides a liquid crystal display module, which comprises the above-mentioned main screen circuit board.

[0007] The technical problems to be solved by the utility model are solved by the following technical solutions:

[0008] A main screen circuit board with adjustable resistance comprises a circuit board body, a peripheral drive circuit for driving a liquid crystal panel is arranged on the circuit board body, the peripheral drive circuit comprises an adjustable resistance, the adjustable resistance comprises an adjustment part, an overmold layer is arranged outside the adjustable resistance, the overmold layer wraps the adjustable resistance and is adhesively fixed to the circuit board body.

[0009] Further, the adjusting part is an adjusting knob.

[0010] Further, the coating glue layer is a waterproof insulating glue layer.

[0011] Further, the coating glue layer is an epoxy resin layer.

[0012] Further, the circuit board body comprises a main screen pin group and a main board pin group, and the peripheral drive circuit is connected between the main screen pin group and the main board pin group.

[0013] Further, the circuit board body further comprises a backlight pad group, and the backlight pad group is electrically connected with the main board pin group.

[0014] Further, the main screen circuit board further comprises a connector plug, and the connector plug is arranged on the main board pin group of the circuit board body.

[0015] Further, the connector plug and the adjustable resistor are located on the same side surface of the circuit board body, and the other side surface of the circuit board body is provided with a reinforcing layer covering the connector plug and the adjustable resistor.

[0016] A liquid crystal display module comprises a liquid crystal panel, a backlight module and the main screen circuit board, the liquid crystal panel is arranged on the light emitting surface of the backlight module, and the main screen circuit board is connected with the liquid crystal panel through the main screen pin group.

[0017] Further, the liquid crystal display module further comprises a backlight circuit board, one end of the backlight circuit board is electrically connected with the backlight module, and the other end is electrically connected with the backlight pad group of the main screen circuit board.

[0018] The main screen circuit board of the utility model has the following beneficial effects: the main screen circuit board of the utility model is provided with the coating glue layer outside the adjustable resistor, the adjustable resistor is entirely wrapped by the coating glue layer, the relative position between the adjusting part of the adjustable resistor and the circuit board body is fixed, the adjusting part of the adjustable resistor is prevented from being exposed, the adjusting part is prevented from being twisted due to being touched by external objects during the production and transportation of the liquid crystal display module, and the resistance value of the adjustable resistor is prevented from deviating. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The utility model provides the plane structure schematic drawing of main screen circuit board.

[0020] Figure 2 The utility model provides the plane structure schematic drawing of main screen circuit board. Figure 1 The utility model provides the plane structure schematic drawing of main screen circuit board.

[0021] Figure 3The utility model provides a plane structure schematic diagram of adjustable resistance in main screen circuit board.

[0022] Figure 4 The utility model provides a plane structure schematic diagram of liquid crystal display module. DETAILED DESCRIPTION

[0023] The utility model will be explained in detail below in combination with the drawings and examples, the example of the example is shown in the drawings, wherein the same or similar label represents the same or similar element or element with the same or similar function throughout. The example described below by referring to the drawings is exemplary, and is intended to explain the utility model, and cannot be understood as the limitation of the utility model.

[0024] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0025] In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second", "third" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0026] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0027] Example one

[0028] As Figure 1 And 2As shown, a main screen circuit board with an adjustable resistor 32 comprises a circuit board body 31, the circuit board body 31 is provided with a peripheral driving circuit (not shown in the figure) for driving a liquid crystal panel, the peripheral driving circuit comprises an adjustable resistor 32, the adjustable resistor 32 comprises an adjusting part 323, the adjustable resistor 32 is externally provided with a coating glue layer 33, the coating glue layer 33 wraps and covers the adjustable resistor 32 and is adhesively fixed with the circuit board body 31.

[0029] The main screen circuit board of the utility model fixes the relative position between the adjusting part 323 of the adjustable resistor 32 and the circuit board body 31 by wrapping and covering the adjustable resistor 32 which has completed adjustment with the coating glue layer 33, and avoids the adjusting part 323 of the adjustable resistor 32 from being exposed, so that the adjusting part 323 is prevented from being twisted due to being touched by external objects during the production and transportation of the liquid crystal display module, and the resistance value of the adjustable resistor 32 is ensured to be accurate and not deviated.

[0030] During assembly, the circuit board body 31 is first bound and connected with the liquid crystal panel, then the liquid crystal panel is lit by driving through the peripheral driving circuit, then the resistance value of the adjustable resistor 32 is adjusted through the adjusting part 323 on the adjustable resistor 32, so that the display effect of the liquid crystal panel meets the requirements, then the adjustable resistor 32 is wrapped and covered with glue by using a dispensing process or other process mode, and finally the glue is cured to form the coating glue layer 33.

[0031] Preferably, the coating glue layer 33 is a waterproof insulating glue layer, such as an epoxy resin layer.

[0032] The adjustable resistor 32 is used for adjusting the contrast, flicker or other display effects of the liquid crystal panel.

[0033] In the embodiment, the number of the adjustable resistor 32 is one, which is used for adjusting the Vcom voltage of the liquid crystal panel, so as to solve the problem of uneven pixel light emission, i.e. flicker problem, caused by the inadaptation of the Vcom voltage.

[0034] Of course, when the adjustable resistor 32 is used for adjusting other display effects of the liquid crystal panel, the number thereof can be two or more than two, which depends on the specific circuit architecture of the peripheral driving circuit. The specific circuit architecture of the peripheral driving circuit is prior art, which is different according to different display effects to be adjusted. In some examples, the peripheral driving circuit adopts the touch display driving compensation circuit disclosed in the Chinese patent with the application number CN202121707149.5.

[0035] As Figure 3As shown, the adjustable resistor 32 further comprises a resistor part 321 and a pad part 322, the adjustable resistor 32 is welded and fixed on the circuit board body 31 through the pad part 322, so as to access the peripheral driving circuit; the resistor part 321 is arranged on the pad part 322, one end of the adjusting part 323 is fixedly connected with the pad part 322, and the other end is movably connected with the resistor part 321.

[0036] The driving current of the peripheral driving circuit flows into the adjustable resistor 32 through the pad part 322, and then flows out of the adjustable resistor 32 through the pad part 322 after sequentially passing through the adjusting part 323 and the resistor part 321, and reenters the peripheral driving circuit; the adjusting part 323 changes the effective length of the driving current when flowing through the resistor part 321 by adjusting the contact position of the adjusting part 323 and the resistor part 321, so as to realize the size adjustment of the driving current.

[0037] In this embodiment, the adjusting part 323 is an adjusting knob, and the resistance value of the adjustable resistor 32 is adjusted by twisting the adjusting knob. In some examples, the adjusting part 323 is an adjusting slider, and the resistance value of the adjustable resistor 32 is adjusted by sliding the adjusting slider.

[0038] The circuit board body 31 comprises a main screen pin group 34 and a main board pin group 35, and the peripheral driving circuit is connected between the main screen pin group 34 and the main board pin group 35. The main screen pin group 34 and the peripheral driving circuit are connected through internal wiring of the circuit board body 31, and the main board pin group 35 and the peripheral driving circuit are also connected through internal wiring of the circuit board body 31.

[0039] Specifically, the circuit board body 31 comprises a first wiring area 311, a second wiring area 312 and a third wiring area 313, the first wiring area 311 is connected to one end of the second wiring area 312, and the third wiring area 313 is connected to the other end of the second wiring area 312; the main screen pin group 34 is arranged in the first wiring area 311, the main board pin group 35 is arranged in the third wiring area 313, and the peripheral driving circuit and the adjustable resistor 32 are arranged in the third wiring area 313.

[0040] That is, the internal wiring connecting the main screen pin group 34 and the peripheral driving circuit is distributed in the first wiring area 311 and the second wiring area 312, and the internal wiring connecting the main board pin group 35 and the peripheral driving circuit is distributed in the third wiring area 313.

[0041] Of course, according to the specific wiring structure, the peripheral driving circuit and the adjustable resistor 32 can also be arranged in the first wiring area 311 or the second wiring area 312 of the circuit board body 31.

[0042] Preferably, the main screen pin group 34 is arranged on an end edge of the first wiring area 311 away from the second wiring area 312, and the main board pin group 35 is arranged on an end edge of the third wiring area 313 close to the second wiring area 312.

[0043] The width of the second wiring area 312 gradually increases from the side connected to the first wiring area 311 to the side connected to the third area, so as to meet the wiring requirement of the second wiring area 312, so that the internal wiring connecting the main screen pin group 34 and the peripheral driving circuit can enter the third wiring area 313 from the side of the main board pin group 35.

[0044] Preferably, the circuit board body 31 further comprises a backlight pad group 37 electrically connected to the main board pin group 35, so as to be connected to the backlight circuit board of the backlight module, thereby supplying power to the backlight module.

[0045] In some examples, the main board pin group 35 of the main screen circuit board can be a plug, and when assembled, the main board pin group 35 is directly plugged into the connector socket on the terminal main board. In some examples, the main screen circuit board further comprises a connector plug 36 arranged on the main board pin group 35 of the circuit board body 31, and when assembled, the main board pin group 35 is plugged into the connector socket on the terminal main board through the connector plug 36.

[0046] Preferably, the connector plug 36 and the adjustable resistor 32 are located on the same side surface of the circuit board body 31, and the other side surface of the circuit board body 31 is provided with a reinforcing layer 38 covering the connector plug 36 and the adjustable resistor 32 (i.e. covering the third wiring area 313), so as to enhance the strength of the circuit board body in the third wiring area 313, and avoid tearing of the third wiring area 313 due to excessive stress when the connector plug 36 and the adjustable resistor 32 are mounted.

[0047] The reinforcing layer 38 can be a rigid reinforcing plate such as a stainless steel plate or an aluminum alloy plate, or a flexible reinforcing film such as a PI film or a PET film.

[0048] Embodiment Two

[0049] As Figure 4The liquid crystal display module comprises a liquid crystal panel 1, a backlight module 2 and the main screen circuit board 3 of the first embodiment, the liquid crystal panel 1 is arranged on the light emitting surface of the backlight module 2, and the main screen circuit board 3 is connected with the liquid crystal panel 1 through the main screen pin group 34.

[0050] Preferably, the liquid crystal display module further comprises a backlight circuit board 4, one end of the backlight circuit board 4 is electrically connected with the backlight module 2, and the other end is electrically connected with the backlight pad group 37 of the main screen circuit board 3.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them, although the preferred embodiments of the present application have been described in detail, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by the same, and these modifications or replacements cannot make the modified technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. A main screen wiring board having an adjustable resistance, comprising a wiring board body provided with a peripheral drive circuit for driving a liquid crystal panel, the peripheral drive circuit including an adjustable resistance, the adjustable resistance including an adjustment portion, characterized in that, The adjustable resistor is externally provided with a coating glue layer which covers the adjustable resistor and is fixedly connected with the circuit board body.

2. The main screen wiring board according to claim 1, characterized by The adjusting part is an adjusting knob.

3. The main screen wiring board of claim 1, wherein, The coating glue layer is a waterproof insulating glue layer.

4. The main screen wiring board according to claim 1 or 2, characterized by The coating glue layer is an epoxy resin layer.

5. The main screen wiring board of claim 1, wherein, The circuit board body comprises a main screen pin group and a main board pin group, and the peripheral drive circuit is connected between the main screen pin group and the main board pin group.

6. The main screen wiring board of claim 5, wherein, The circuit board body further comprises a backlight pad group which is electrically connected with the main board pin group.

7. The main screen wiring board of claim 5, wherein, The main screen circuit board further comprises a connector plug which is arranged on the main board pin group of the circuit board body.

8. The main screen wiring board of claim 7, wherein, The connector plug and the adjustable resistor are located on the same side surface of the circuit board body, and the other side surface of the circuit board body is provided with a reinforcing layer which covers the connector plug and the adjustable resistor.

9. A liquid crystal display module, characterized by comprising: The liquid crystal display module comprises a liquid crystal panel, a backlight module and the main screen circuit board of claim 1, the liquid crystal panel is arranged on the light emitting surface of the backlight module, and the main screen circuit board is connected with the liquid crystal panel through the main screen pin group.

10. The liquid crystal display module of claim 9, wherein the liquid crystal display module is a liquid crystal display module for a mobile phone. The liquid crystal display module further comprises a backlight circuit board, one end of the backlight circuit board is electrically connected with the backlight module, and the other end is electrically connected with the backlight pad group of the main screen circuit board.

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