Display screen brightness control device, air conditioner and method for controlling display screen brightness

Abstract

The invention provides a display screen brightness control device, an air conditioner and a method for controlling the display screen brightness. The display screen brightness control device comprises a plurality of driving circuits, a brightness adjusting circuit and a processor. According to the driving circuits, when selection signals from the processor are received, a corresponding backlight lamp set is driven and when brightness control signals from the brightness adjusting circuit are received, the average working voltage of the corresponding backlight lamp set is adjusted; when brightness adjusting signals from the processor are received by the brightness adjusting circuit, the brightness control signals are output to the driving circuits at the same time by the brightness adjusting circuit; when a display order is received by the processor, turn-on and turn-off signals are output to the backlight lamp sets, the corresponding selection signals are output to the driving circuits according to the turn-on and turn-off signals, and when a brightness adjusting order is received, the brightness adjusting signals are output to the brightness adjusting circuit. According to the display screen brightness control device, combined control of time series and frequency modulation are conducted on the display screen, the brightness of the matrix type LED display screen is simply adjusted, and control is simple.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a display brightness control device, an air conditioner and a display brightness control method. Background technique [0002] At present, the brightness adjustment of the display screen is controlled by a PWM (Pulse Width Modulation, pulse width modulation) to control the brightness of one or a group of LED (Light-Emitting Diode, light-emitting diode) lamps. If you need to control the brightness of multiple groups of LEDs, Multiple PWM generating circuits are needed. The number of built-in PWM modules in existing microprocessors is limited, generally only a few, and a timer is also occupied at the same time. If multiple sets of PWM applications are required, a professional-grade PWM control chip is required. , so that not only the circuit is complicated but also the cost is high. [0003] Most of the existing air conditioner display screens are composed of multiple gro...

AI Technical Summary

Problems solved by technology

[0002] At present, the brightness adjustment of the display screen is controlled by a PWM (Pulse Width Modulation, pulse width modulation) to control the brightness of one or a group of LED (Light-Emitting Diode, light-emitting diode) lamps. If you need to control the brightness of multiple groups of LEDs, Multiple PWM generating circuits are needed. The number of built-in PWM modules in existing microprocessors is limited, generally only a few, and a timer is also occupied at the same time. If multiple sets of PWM applications are required, a professional-grade PWM control chip is required. , so that not only the circuit is complicated but also the cost is high

[0003] Most of the existing air conditioner display screens are composed of multiple groups of LEDs. At the same time, ultra-high-brightness LEDs are more and more widely used because of their narrow voltage range (such as the limit voltage is 2.8V or lower). PWM is used to control the brightness. Since the voltage output by PWM is not very stable, it is usually necessary to add energy storage capacitors and filter capacitors, which are prone to flickering, and the range of brightness adjustment is limited, which cannot well meet the brightness adjustment needs of users.

[0004] Therefore, a new display brightness control technology is needed, which can use a relatively simple circuit to adjust the brightness of the display screen and solve the problem of flickering of the display screen at low brightness.

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