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In this lesson, we will talk about the display power chip

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In mobile phones, in order to better control the work of the display,

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the display power supply chip is independently designed to provide power for the display

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We usually call it a display chip

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Its voltage has positive voltage and negative voltage

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They are different

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During maintenance,

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we need to pay attention to whether the mobile phone uses an LCD screen or an OLED screen

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The operating voltages required for these two screens are different

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For example, the picture on the left shows a display power supply chip

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Let's take a look

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Inside the OLED screen,

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the pixel control unit has its own light-emitting function,

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using only one chip

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This display chip has some characteristics

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First, it is surrounded by three large inductors,

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like this chip,

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there are three large inductors here,

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surrounding this display chip

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And it is commonly a square 16-pin chip

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For example, the one on the left,

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its models start with PF31, 32B,

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or DOS04, DOS05, or TPS65633, or TPS65634, etc.

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This is its appearance feature,

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surrounded by three inductors,

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square, 16 pins, starting with PF, DOS, or TPS

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Tits is also a display power supply chip, its number is DOS04

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It's surrounded by three inductors

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This is an OLED screen

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Let's look at the inductors

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There are three inductors, then this chip is TPS65634

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This is also a display power supply chip, LCD backlight screen,

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it uses the power supply method of display chip plus backlight chip to provide power to the screen

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the display chip of the backlight screen has a characteristic

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It is generally a rectangle with a large inductor on the side

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The common models include GR, TPS, and LM

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the display power supply and backlight power supply of Huawei mobile phones are integrated

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That is to say,

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the display power supply and the backlight power supply are completed by one chip,

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and the LM series chips are used

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For example,

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the chip starting with GR in the picture integrates

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the display power supply and the backlight power supply,

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and has a large inductor next to it

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This chip, LM36274,

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is the power supply chip for the display screen on the mainboard of the mobile phone

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It is also the power supply chip for the backlight

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there is a large inductor next to it and a diode

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Okay, that's it for this lesson