Method and device for adjusting backlight of liquid crystal display screen as well as terminal equipment

Abstract

The invention provides a method for adjusting backlight of a liquid crystal display screen. The backlight brightness is divided into multiple brightness grades from darkness to brightness, wherein all-on indicates the highest grade marked as the N-th brightness grade, and N is a positive integer greater than 1. The method comprises the following steps: A, obtaining the duty cycle of the current backlight brightness grade M of the liquid crystal display screen, and marking as the M-th grade duty cycle; B, obtaining the duty cycle of the next brightness grade (M-1) adjacent to the current brightness grade, and marking as the (M-1)th grade duty cycle; and C, dividing the interval between the (M-1)th grade duty cycle and the Mth grade duty cycle into multiple sections; reducing the backlight duty cycle of the liquid crystal display screen from the Mth grade duty cycle to the (M-1)th grade duty cycle in turn according to the division; and increasing the backlight duty cycle of the liquid crystal display screen from the (M-1)th grade duty cycle to the Mth grade duty cycle, wherein M is a positive integer and more than or equal to 1 and less than or equal to N. Through the invention, the power consumption of the terminal equipment is effectively reduced, and the terminal equipment using time is prolonged in the condition of limited power supply of batteries.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to an automatic adjustment method, a device, and a terminal for backlighting a liquid crystal display on a terminal device. Background technique [0002] At present, liquid crystal display screens are widely used in various fields, and the most common application in the early stage is digital products, such as calculators. With the increasing size of liquid crystal display screens in recent years, liquid crystal display screens are also used in other electronic devices, such as portable computers, which are currently the most widely used. [0003] The most commonly used LCD backlight control method by major portable computer manufacturers is to use PWM (Pulse Width Modulation) method. Specifically, the frequency of the PWM signal is fixed in advance, and the purpose of changing the brightness of the backlight is achieved by changing the positive pulse width. The br...

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problem that manual adjustment of the backlight of the existing liquid crystal display is inconvenient and cannot reduce the power consumption of the liquid crystal display, and provides a method for adjusting the backlight of the liquid crystal display, which automatically adjusts the backlight of the liquid crystal display and reduces the power consumption of the liquid crystal display. Purpose of Display Power Consumption

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