Introduction to LCM structure

Feb 27, 2021 | Articles


1. TP

Touch Panel touch screens, commonly 4-wire resistive touch screens. The user can use the stylus directly or fingers to operate.

2. TFT Panel

The panel that provides the display for the entire display module and is the most important component of the display module, the panel performance determines its display effect, high resolution, high contrast, high color reproduction, correspondingly fast time, transparent
The characteristics of the over type, semi-permeable type, etc.

Display size development

The generation change of the LCD Panel plant is divided by the size of its glass substrate. 1st Generation TFT-LCD
The glass substrate size of the production line is 300mm×400mm-320mm×400mm, and then the glass substrate size of each generation of the factory has increased compared to the previous generation, and in the third generation, it is 5XXmm×6XXmm, 6XXmm×7
The XXmm is a 3.5-generation line, the 4-generation line is 6XXmm×8XXmm-7XXmm×9XXmm (also classified as a 4.5-generation line), and the 5-generation line is available in 1000mm×1200mm and 1100mm×1250mm sizes.


Take Corning, the world’s largest glass substrate manufacturer, as an example, the dimensions of its glass substrates for each generation are as follows:
G8: 2160mm×2460mm
G7: 1870mm x 2200mm
G6: 1500mm x 1800mm
G5: 1100mm x 1250mm
G4: 680mm x 880mm (Image)
G3: 550mm x 650mm
G2: 370mm x 470mm
G1: 300mm×400mm



Major suppliers of display screens

At present, LCD panel suppliers are mainly from Japan, Korea, and Taiwan, with only Beijing Jingdong in mainland China
Fang BOE, Shanghai Broadcasting Corporation, Shenzhen Tianma has a production line.

Japan: TMD, SHARP, NEC, Sanyo, Kyocera, Toshiba, etc.
Korea: Samsung, LPL.
Introduction and Design of Small and Medium Size LCD Module Page 19
Taiwan: AUO, CMO, TPO, CPT, Hanstar, PVI, etc.
Hong Kong: Varitronix Varitronix (Mono, STN), Truly.
Mainland China: BOE, SVA.

3. BZ

BZ, commonly known as Bezel, is a stainless steel SUS304 series material. Thicknesses commonly 0.1, 0.15, 0.2.
0.3, 0.5mm, or other thickness.
The main role of BZ is to strengthen the structure of the LCD module, protect the corresponding parts, reduce the impact of external forces, etc.
Usually, where construction, thickness and price allow, the upper and lower iron frames can be designed so that the entire product can be
Within the protection of an iron frame.

4. BLU

The Back Light Unit is a backlight that serves primarily to illuminate a non-self-illuminated Panel. small and medium-sized ruler
The inch basically uses various colors of the LED light source, now, in the large size also began to use LED backlight, such as LED pen
Notebooks, LED LCD TVs.

5. FPA

Flexible Printed Board Assembly. is usually divided into three types: hardboard, soft board, and soft-rigid combination board.
The main function of the FPA flexible circuit board is to connect the display to the motherboard and to install the peripheral power of each IC.
The circuit components, as well as other components designed. It can be bent and flexed according to design requirements, thin thickness.
Lightweight and easy processing.

6. PCB

Printed Circuit Board rigid board. The main function is to connect the display to the motherboard and install other components or connected to other parts. Usually, you can do 4 layers, 8 layers, 10 layers, 20 layers of lines, etc.

7. Duct tape

There are generally three kinds of tapes: adhesive tape with one or two sides, insulating tape, and conductive tape. Design
The required material does not need to be of the appropriate performance and thickness.
The tape in the picture above is the double-sided tape used to connect the backlight to the PCB board.

8. Accessories

Conductive cloth, foam, tape, or some non-essential materials specified by the customer are collectively referred to as auxiliary materials. Depending on the design
The design or assembly is done on request or at the request of the customer.

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