Circuit for adjusting faults of liquid crystal screen

Abstract

The utility model discloses a circuit used for adjusting faults of a liquid crystal screen, which comprises an output voltage adjusting circuit and an output negative voltage adjusting circuit, the output voltage adjusting circuit comprises IN1, IN2 +, IN4 +, D1BAV99, R1, R2, C2, C2 and OUT1 +, a pin 3 of the D1BAV99 is connected with C1, an access end of the C1 is connected with the IN1, a pin 1 of the D1BAV99 is connected with the IN2 +, a pin 2 of the D1BAV99 is connected with the IN4 + and the R1, an output end of the R1 is connected with the R2, the C2 and the OUT1 +, and the other end of the R2 and the other end of the C2 are connected with a ground wire. The output negative voltage regulating circuit comprises an IN1, an IN3-, an IN5-, a D2BAV99, an R3, an R4, a C3, a C4 and an OUT2-, a pin 1 of the D2BAV99 is connected with the C3, an access end of the C3 is connected with the IN1, a pin 2 of the D1BAV99 is connected with the IN3-, a pin 2 of the D1BAV99 is connected with the IN5-and the R3, an output end of the R3 is connected with the R4, the C4 and the OUT2-, and the other ends of the R4 and the C4 are connected with a ground wire. According to the utility model, the circuit is added to the tcon board of the liquid crystal display television, and the voltage of OUT1 + and OUT2-is changed, so that the problems of color cast, cross grains, coarse screen and the like caused by gate driver on one side of the liquid crystal display screen are solved.

Description

Technical Field

[0001] The utility model belongs to the field of circuits for liquid crystal screen failures, and in particular relates to a circuit for adjusting liquid crystal screen failures. Background Art

[0002] With the continuous advancement of LCD technology, more and more GOA (Gate Driver On Array) drivers are used. When one side fails and cannot be repaired, it is necessary to disconnect the faulty side and use single-sided driving. However, many LCD screens will have color cast, horizontal stripes, coarse screen and other faults after single-sided operation. Due to the lack of information and debugging tools, many problems cannot be solved. By adding this small board to the original board and changing the voltage of OUT+ and 0UT-, the problem can be solved. Utility Model Content

[0003] The purpose of the utility model is to provide a circuit for adjusting a liquid crystal screen fault, aiming to solve the problems existing in the background technology. To achieve the above purpose, the technical solution adopted by the utility model is:

[0004] A circuit for adjusting a liquid crystal screen fault, comprising an output voltage regulating circuit and an output negative voltage regulating circuit, wherein the output voltage circuit comprises an input port IN1, an input port IN2 positive, an input port IN4 positive, a diode D1BAV99, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an output port OUT1 positive, a pin 3 of the diode D1BAV99 is connected to the capacitor C1, an access end of the capacitor C1 is connected to the input port IN1, a pin 1 of the diode D1BAV99 is connected to the input port IN2 positive, a pin 2 of the diode D1BAV99 is connected to the input port IN4 positive and the resistor R1, an output end of the resistor R1 is connected to the resistor R2, the capacitor C2 and the output port OUT1 positive, and the other ends of the resistor R2 and the capacitor C2 are connected to a ground wire;

[0005] The output negative voltage regulation circuit includes an input port IN1, a negative input port IN3, a negative input port IN5, a diode D2BAV99, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and a negative output port OUT2. Pin 1 of the diode D2BAV99 is connected to the capacitor C3, the access end of the capacitor C3 is connected to the input port IN1, pin 2 of the diode D1BAV99 is also connected to the negative input port IN3, pin 2 of the diode D1BAV99 is connected to the negative input port IN5 and the resistor R3, the output end of the resistor R3 is connected to the resistor R4, the capacitor C4 and the negative output port OUT2, and the other ends of the resistor R4 and the capacitor C4 are connected to the ground wire.

[0006] Preferably, the resistor R1 and the resistor R3 are variable resistors, the resistance value of the resistor R1 and the resistor R3 is 0-2000Ω, the maximum rated power of the resistor R1 and the resistor R3 is 3296W, and the resistance value of the resistor R2 and the resistor R4 is 10KΩ.

[0007] Preferably, the capacitors C1 and C3 are 0.1u, the capacitors C2 and C4 are 2.2u, and the capacitors C2 and C4 are 50V.

[0008] Preferably, the positive voltage boosting principle of the output port OUT1 is: the input port IN2 is connected to a DC low voltage, and the input port IN1 is connected to a square wave pulse, and a voltage higher than the positive voltage of the input port IN2 will be output at the OUT1 end, and its voltage value is approximately equal to the sum of the positive voltage of the input port IN2 and the input port IN1. By adjusting the resistance value of the potentiometer resistor R1, the voltage value of the positive output of the output port OUT1 can be changed to achieve positive voltage boosting.

[0009] Preferably, the positive voltage step-down principle of the output port OUT1 is: a DC voltage is connected to the positive end of the input port IN4, and by adjusting the resistance value of the resistor R1, a voltage value lower than the positive voltage of the input port IN4 can be obtained at OUT1, thereby realizing the positive voltage step-down principle.

[0010] Preferably, the negative voltage boost principle of the output port OUT2 is: the input port IN3 negative is connected to a DC negative voltage, and the input port IN1 is connected to a square wave pulse, and a voltage higher than the input port IN3 negative will be output at the negative end of the output port OUT2, and its voltage value is approximately equal to the sum of the input port IN3 negative and the input port IN1. By adjusting the resistance value of the potentiometer resistor R3, the voltage value of the negative output of the output port OUT2 can be changed to achieve negative voltage boosting.

[0011] Preferably, the negative voltage step-down principle of the output port OUT2 is: a DC negative voltage is connected to the negative end of the input port IN5, and by adjusting the resistance value of the resistor R3, a voltage value lower than the negative voltage of the input port IN3 can be obtained at the negative end of the output port OUT2, thereby realizing the negative voltage step-down principle.

[0012] The beneficial effects of the utility model are as follows: by adding the circuit to the tcon board of the LCD TV and changing the voltage of the positive output port OUT1 and the negative output port OUT2, the problems of color cast, horizontal stripes and screen coarseness caused by the single-sided gate driver of the LCD screen are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 An overall schematic diagram provided for an embodiment of the utility model;

[0014] Figure 2 A schematic diagram of an output voltage regulation circuit provided by an embodiment of the utility model;

[0015] Figure 3 A schematic diagram of an output negative voltage regulation circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are positional relationships with reference to the accompanying drawings.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0019] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0020] like Figures 1 to 3As shown, the embodiment of the utility model provides a circuit for adjusting a liquid crystal screen fault, including an output voltage regulating circuit and an output negative voltage regulating circuit, the output voltage circuit includes an input port IN1, an input port IN2 positive, an input port IN4 positive, a diode D1BAV99, a resistor R1, a resistor R2, a capacitor C2, a capacitor C2 and an output port OUT1 positive, a pin 3 of the diode D1BAV99 is connected to the capacitor C1, an access end of the capacitor C1 is connected to the input port IN1, a pin 1 of the diode D1BAV99 is connected to the input port IN2 positive, a pin 2 of the diode D1BAV99 is connected to the input port IN4 positive and the resistor R1, an output end of the resistor R1 is connected to the resistor R2, the capacitor C2 and the output port OUT1 positive, and the other ends of the resistor R2 and the capacitor C2 are connected to a ground wire;

[0021] The output negative voltage regulation circuit includes an input port IN1, a negative input port IN3, a negative input port IN5, a diode D2BAV99, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and a negative output port OUT2. Pin 1 of the diode D2BAV99 is connected to the capacitor C3, the access end of the capacitor C3 is connected to the input port IN1, pin 2 of the diode D1BAV99 is also connected to the negative input port IN3, pin 2 of the diode D1BAV99 is connected to the negative input port IN5 and the resistor R3, the output end of the resistor R3 is connected to the resistor R4, the capacitor C4 and the negative output port OUT2, and the other ends of the resistor R4 and the capacitor C4 are connected to the ground wire.

[0022] In the embodiment, the resistor R1 and the resistor R3 are variable resistors, the resistance value of the resistor R1 and the resistor R3 is 0-2000Ω, the maximum rated power of the resistor R1 and the resistor R3 is 3296W, and the resistance value of the resistor R2 and the resistor R4 is 10KΩ

[0023] In the embodiment, the capacitor C1 and the capacitor C3 are 0.1u, the capacitor C2 and the capacitor C4 are 2.2u, and the capacitor C2 and the capacitor C4 are 50V.

[0024] In the embodiment, the positive voltage boosting principle of the output port OUT1 is: the input port IN2 is connected to a DC low voltage, and the input port IN1 is connected to a square wave pulse, and a voltage higher than the positive voltage of the input port IN2 will be output at the OUT1 end, and its voltage value is approximately equal to the sum of the positive voltage of the input port IN2 and the input port IN1. By adjusting the resistance value of the potentiometer resistor R1, the voltage value of the positive output of the output port OUT1 can be changed to achieve positive voltage boosting.

[0025] In the embodiment, the positive voltage step-down principle of the output port OUT1 is as follows: a DC voltage is connected to the positive end of the input port IN4, and by adjusting the resistance value of the resistor R1, a voltage value lower than the positive voltage of the input port IN4 can be obtained at OUT1, thereby realizing the positive voltage step-down principle.

[0026] In the embodiment, the negative voltage boosting principle of the output port OUT2 is: the negative input port IN3 is connected to a DC negative voltage, and the input port IN1 is connected to a square wave pulse, and a voltage higher than the negative input port IN3 will be output at the negative end of the output port OUT2, and its voltage value is approximately equal to the sum of the negative input port IN3 and the input port IN1. By adjusting the resistance value of the potentiometer resistor R3, the voltage value of the negative output of the output port OUT2 can be changed to achieve negative voltage boosting.

[0027] In the embodiment, the negative voltage step-down principle of the output port OUT2 is as follows: a DC negative voltage is connected to the negative end of the input port IN5, and by adjusting the resistance value of the resistor R3, a voltage value lower than the negative voltage of the input port IN3 can be obtained at the negative end of the output port OUT2, thereby realizing the negative voltage step-down principle.

[0028] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A circuit for adjusting a liquid crystal screen fault, characterized in that: It includes an output voltage regulation circuit and an output negative voltage regulation circuit, wherein the output voltage circuit includes an input port IN1, an input port IN2 positive, an input port IN4 positive, a diode D1BAV99, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and an output port OUT1 positive, wherein the pin 3 of the diode D1BAV99 is connected to the capacitor C1, the access end of the capacitor C1 is connected to the input port IN1, the pin 1 of the diode D1BAV99 is connected to the input port IN2 positive, the pin 2 of the diode D1BAV99 is connected to the input port IN4 positive and the resistor R1, the output end of the resistor R1 is connected to the resistor R2, the capacitor C2 and the output port OUT1 positive, and the other ends of the resistor R2 and the capacitor C2 are connected to a ground wire; The output negative voltage regulation circuit includes an input port IN1, a negative input port IN3, a negative input port IN5, a diode D2BAV99, a resistor R3, a resistor R4, a capacitor C3, a capacitor C4 and a negative output port OUT2. Pin 1 of the diode D2BAV99 is connected to the capacitor C3, the access end of the capacitor C3 is connected to the input port IN1, pin 2 of the diode D1BAV99 is also connected to the negative input port IN3, pin 2 of the diode D1BAV99 is connected to the negative input port IN5 and the resistor R3, the output end of the resistor R3 is connected to the resistor R4, the capacitor C4 and the negative output port OUT2, and the other ends of the resistor R4 and the capacitor C4 are connected to a ground wire.

2. A circuit for adjusting a liquid crystal screen fault according to claim 1, characterized in that: The resistor R1 and the resistor R3 are variable resistors, the resistance values ​​of the resistor R1 and the resistor R3 are 0-2000Ω, the maximum rated power of the resistor R1 and the resistor R3 is 3296W, and the resistance values ​​of the resistor R2 and the resistor R4 are 10KΩ.

3. A circuit for adjusting a liquid crystal screen fault according to claim 1, characterized in that: The capacitors C1 and C3 are 0.1u, the capacitors C2 and C4 are 2.2u, and the capacitors C2 and C4 are 50V.

Images