Backlight power supply, display device and electronic equipment
A technology for display devices and power supplies, which is applied to output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc. and other problems, to achieve the effect of small channel loss, improved battery life, and improved efficiency
Inactive Publication Date: 2022-04-29
HONOR DEVICE CO LTD
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Problems solved by technology
[0003] The backlight power supply of traditional LCD generally adopts the structure of the combination of boost circuit and constant current source circuit. Due to the large power consumption of the boost circuit, the efficiency of the backlight power supply is low. Generally, the efficiency of the backlight power supply is about 85% to 90%. And then affect the battery life of electronic equipment
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[0028] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
[0029] Words such as "first" and "second" in the following descriptions are used for description purposes only, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, a feature defined as "first", "second", etc. may expressly or implicitly include one or more of that feature. In the description of the present application, unless otherwise specified, "plurality" means two or more.
[0030] In this application, unless otherwise specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral body; it can be a direct connection, or It can be connected indirectly through an intermediary. In additio...
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The invention discloses a backlight power supply, a display device and electronic equipment. The backlight power supply comprises a charge pump, a booster circuit and a constant current source circuit, the input end of the charge pump is used for connecting a battery, the output end of the charge pump is connected with the input end of the booster circuit, the output end of the booster circuit is connected with the first end of the LED lamp string, and the second end of the LED lamp string is grounded through the constant current source circuit; the charge pump boosts the battery voltage by a preset multiple and then provides the boosted circuit; the booster circuit boosts the output voltage of the charge pump and then provides the boosted output voltage to the LED lamp string; the constant current source circuit carries out constant current control on the LED lamp string. The charge pump is small in path loss and high in efficiency, the higher the input voltage of the booster circuit is, the lower the input current is, the current flowing through the power inductor in the booster circuit is reduced, and the power consumption caused by the large inductive current is reduced. And the conduction loss of the main power tube and the follow current tube is reduced. The backlight power supply is relatively high in efficiency, so that the cruising ability of the electronic equipment can be improved.
Description
technical field [0001] The present application relates to the technical field of electronic circuits, in particular to a backlight power supply, a display device and electronic equipment. Background technique [0002] In portable products, such as mobile phones and tablets, the backlight power consumption of liquid crystal displays (LCD, Liquid Crystal Display) accounts for a large proportion of power consumption. The power consumption of the backlight power accounts for more than 40%. The greater the power consumption of the LCD backlight power, the lower the efficiency of the backlight power. Therefore, the efficiency of LCD's backlight power supply directly affects the battery life of portable products. [0003] The backlight power supply of traditional LCD generally adopts the structure of the combination of boost circuit and constant current source circuit. Due to the large power consumption of the boost circuit, the efficiency of the backlight power supply is low. Gen...
Claims
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IPC IPC(8): G09G3/34H02M3/07H02M3/158H05B45/345H05B45/3725H05B45/38
CPCG09G3/3406H05B45/38H05B45/3725H05B45/345H02M3/07H02M3/158Y02B20/30Y02B20/40
Inventor 吉庆王朝
Owner HONOR DEVICE CO LTD