What is an external screen

The external screen refers to the outermost glass of the mobile phone screen, which is the sensor screen of the mobile phone; the function of the external screen is to sense corresponding input, just like a combination of keyboard and mouse. The external screen corresponds to the internal screen, which is the display screen of the mobile phone and is used to display images, just like a computer monitor. If the external screen is broken, the characteristic is that the touch does not work or has no touch feeling; if the inner screen is broken, the characteristic is that the display cannot be displayed or the display is incomplete.

The operating environment of this tutorial: HarmonyOS 2 system, HONOR V30 mobile phone.

Mobile phone screens are divided into external screens and internal screens. The external screen refers to the outermost glass of the mobile phone screen, which is the part that we touch with our fingers every day.

Below the external screen is the second part of the mobile phone display, which is simply the part displayed by the mobile phone. The external screen and display together are called a component, which is installed on the front of the frame of the third part of the mobile phone. On the back of the frame is the mobile phone motherboard battery and the tail plug-in small board.

The functions of the inner and outer screens:

1: Inner screen: display screen, showing images, just like a computer monitor ;

2: External screen: induction screen. It is a sensor corresponding input, like a combination of keyboard and mouse.

Characteristics of inner and outer screen fragmentation:

• The inner screen is broken, which is characterized by: the mobile phone screen cannot be displayed or the display is incomplete, and liquid leakage appears inside the screen (blurred screen or large black spots).

• The external screen is broken, which is characterized by: in severe cases, the mobile phone screen does not work well or has no touch feeling. In the case of mild fragmentation, the mobile phone can be used normally.

Commonly used methods to prevent broken mobile phone screens:

1. Wear a mobile phone case, a soft mobile phone case It can play a certain protective role in protecting the mobile phone, but it is not conducive to the heat dissipation of the mobile phone.

2. With a case, a mobile phone case can also effectively prevent scratches on the appearance of the mobile phone.

3. Apply a film. Apply a tempered glass film to your mobile phone, which can be anti-scratch, explosion-proof, etc., and can also protect your eyesight. When the phone accidentally falls to the ground, it can play a role in buffering and protecting it.

Summary: The above methods can play a certain role in prevention and protection. If you want to completely prevent the screen from breaking, just try not to drop it. Generally speaking, mobile phones cannot withstand heavy drops. If the screen is accidentally seriously broken, it will need to be replaced after-sales service.

Expand knowledge: Introduction to mobile phone screens

In recent years, with the rapid promotion and popularization of smartphones, the global mobile phone screen market has grown and technological innovation has accelerated, and the industry scale has continued to expand. promote. From the perspective of product composition, current mobile phone screens are mainly touch screens, which are mainly composed of cover glass, touch modules, display modules and other components. However, as the requirements for mobile phones to become thinner, lighter and have high-definition displays continue to increase, As well as the increasing maturity of embedded touch technology, the mobile phone screen industry is gradually developing from traditional single component supply to integrated module production, and the trend of vertical integration of the industry chain is obvious.

• Cover glass: The outermost protective component of the mobile phone screen. Its upstream glass substrate industry has high investment thresholds and production technology requirements. The market is mainly dominated by Corning of the United States, Asahi Glass of Japan, Companies such as Electric Glass and German Schott have a monopoly, and domestic manufacturers mainly focus on substrate processing and manufacturing.

• Touch module: a key link to improve the human-computer interaction experience of mobile phones. Currently, TDDI (Touch with Display Driver Integration) integrating touch IC and panel driver IC is the mainstream solution. As the product manufacturing process becomes increasingly mature, the yield rate continues to increase, and the industry's profitability is strong.

• Display modules: Mainly divided into two categories: LCD and OLED. LCD display modules are composed of polarizers, color filters, liquid crystals, TFT (glass), backlight panels, etc. , is currently the most widely used display screen in smartphones; OLED display modules are mainly composed of polarizers, Encap (glass), organic self-luminous layers, TFT (glass), etc., with self-luminescence, simple manufacturing process, low energy consumption, Ultra-thin and bendable, it is one of the emerging mainstream display technologies.

Classification:

• According to the material of the screen, the current mainstream screens for smartphones can be divided into two categories, one is LCD (Abbreviation for Liquid Crystal Display), that is, liquid crystal displays, such as TFT and SLCD screens; the other is OLED (abbreviation for Organic Light-Emitting Diode), which is organic light-emitting diodes, such as AMOLED series screens. The most fundamental difference between LCD and OLED is that OLED is self-illuminating, while LCD needs to be illuminated by a backlight to display.

• According to the display technology driving method of the screen, it can be divided into two categories: passive matrix (Passive Matrix) and active matrix (Active Matrix). The difference between a passive matrix and an active matrix lies in the way the current is driven. When an external current passes through, the arrangement of the liquid crystal will change. After the current stops, if the arrangement of the liquid crystal does not return to its original position (memory), it is called an active matrix; once the current disappears, it returns to its original position and must be reset again. Arrays that can only be charged are called passive matrices.

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