Method and device for controlling voltage of LCD (liquid crystal display) based on ladder resistance network

Abstract

The invention discloses a method and a device for controlling the voltage of an LCD (liquid crystal display) based on a ladder resistance network. The method comprises the following steps of regularly detecting the current voltage of a power supply which powers the LCD, and determining a voltage interval to which the current voltage belongs; according to a corresponding relation between the preset voltage interval and the number of voltage-dividing resistors, acquiring the number of the voltage-dividing resistors corresponding to the voltage interval to which the current voltage belongs; and according to the acquired number of the voltage-dividing resistors, adjusting the number of the voltage-dividing resistors connected to the ladder resistance network. By the method and the device, the real-time voltage of the power supply which powers the LCD is detected regularly and the number of the voltage-dividing resistors connected to the ladder resistance network is dynamically adjusted, so that the driving voltage of the LCD is kept stable, and the display effect of the LCD is ensured.

Description

technical field [0001] The present invention relates to the field of electricity, in particular, to a method and device for controlling the voltage of an LCD (Liquid Crystal Display, liquid crystal display) based on a ladder resistor network. Background technique [0002] At present, there are two commonly used methods to generate LCD voltage drive: (1) Ladder resistor network; (2) Charge pump. Among them, the ladder resistor network method is the most commonly used. This method uses relatively cheap resistors to generate multi-level LCD voltages, and is generally suitable for occasions where the power supply voltage is stable. [0003] Generally speaking, the battery used as a power source for handheld devices has large power supply voltage fluctuations. When used in LCD driving, it is easy to make the LCD voltage drive unstable, resulting in poor LCD display quality. The specific performance is: the power supply voltage of the battery will continue to drop during use, cau...

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Problems solved by technology

[0003] Generally speaking, the battery used as a power source for handheld devices has large power supply voltage fluctuations. When used in LCD driving, it is easy to make the LCD voltage drive unstable, resulting in poor LCD display quality.

The specific performance is: the power supply voltage of the battery will continue to drop during use, resulting in the multi-level LCD voltage generated by the ladder resistor network will also drop accordingly, and finally cannot meet the voltage required for LCD driving, resulting in blurred LCD display

[0004] In order to solve the above problems, some manufacturers reduce the VOP (Operating Voltage) value of the liquid crystal when designing products. This can solve the problems caused by the application of battery power in low-voltage situations, but in high-voltage situations, it will Bring new problems such as ghosting when LCD display

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