Method for adjusting backlight brightness of thin film field effect transistor screen in automotive system

Abstract

The method discloses a method for adjusting the backlight brightness of a thin film transistor screen in an automobile system. A sensor is utilized for detecting a negative end voltage signal of an LED backlight assembly to the ground and transmitting the voltage signal to a feedback circuit; the feedback circuit provides a feedback signal to the control end of a DC voltage transformation circuit; and the DC voltage transformation circuit, according to the feedback signal, dynamically adjusts the voltage of the voltage output end of the DC voltage transformation circuit and maintains the balance of the working current in the LED backlight assembly. According to the invention, after a light adjusting signal in the form of pulse-width modulation is sent to the feedback circuit, the voltage of the voltage output end of the DC voltage transformation circuit can be changed so that the working current in the LED backlight assembly is changed, and backlight brightness is adjusted. By using the method provided by the invention, high-frequency heavy current is prevented from being injected to grounding reference level, the reference level on a circuit board is stable, and a larger-dimension screen can be supported.

Description

Technical field: [0001] The invention relates to the electrical field, in particular to a thin film field effect transistor screen, in particular to a method for adjusting the backlight brightness of a thin film field effect transistor screen in an automobile system. Background technique: [0002] Thin Film Transistor screens (Thin Film Transistor screens, hereinafter referred to as TFT screens) are widely used in car entertainment systems. The development trend of in-vehicle entertainment systems requires larger and larger TFT screen sizes. The main component of the TFT screen is the LED backlight drive circuit. The control of the backlight directly affects the user experience. The light-emitting diode backlight is composed of a series of light-emitting diodes. In the prior art, the brightness is adjusted by turning off the circuit of the light-emitting diodes, and then controlling the time ratio between turning on and turning off (that is, the duty cycle). When the size...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for adjusting the brightness of the TFT screen backlight in the automotive system, and the method for adjusting the brightness of the TFT screen backlight in the automotive system will solve the problems in the prior art through the duty cycle. The method of adjusting the brightness of the backlight of the TFT screen causes a technical problem that the ground reference level of the entire circuit board fluctuates greatly

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