The segment code LCD screen is the mainstream display product in the 1960s. It was first developed in Japan, providing simple and quick display effects, fast response, high contrast, and low cost. In the 1980s, the process was introduced from China to China and was once widely used in various industries. In the 1980s, it was the first to introduce the STN production line in the mainland, which further improved the viewing angle of the segment code LCD screen, making the segment code LCD screen maintain a 40-year development momentum in China.
The segment code LCD screen is mainly to replace the LED digital tube (composed of 7 pen segments for displaying numbers 0~9), such as calculators, clocks, etc. The display contents are all digital and also relatively simple.
In today's life, many electronic devices will use segment code LCD screens. The segment code LCD screens are usually more customized. What is the procedure for opening molds for segment code LCD screens?
Customized segment code LCD screen need to provide parameters
1, you need the size (important is the size of the window)
2, Whether the backlight is needed (if it is needed at night, it is recommended to use backlight)
3, the driver is to do their own or let Chiyu micro-do (let the Chiyu micro-does, is the segment code LCD module with a PCB board)
4, to provide a display or drawing 5, what color is required (usually with blue on white, black on yellow, black on white, black on white, and white on black)
6, working voltage
7, the connection method is a metal pin or conductive tape
8, is completely transparent or semi-permeable
9、Whether the viewing angle is better or general (TN LCD, STN LCD, FSTN LCD VA LCD)
Segment code LCD screen opening process
1, the mold opening process
l) Data verification: dimensions, display graphics, logic tables, display modes, drive parameters (Vo, Duty, Bias), connection methods, temperature conditions, etc.
2) Drawing: Outline Drawing Design
3) Drawing Confirmation: Drawing Modification
4) Mould making: layout design, photolithography film production (electrode x2, border, silver dot, PI, test PCB), screen printing mesh, letterpress, test frame
5) Sample preparation: sample making
6) sample confirmation: re-sample or modify the mold and then re-sample
2, Molding cycle: Generally, drawing 1 to 3 days, the complexity of the view paper and the integrity of the original data; the sampling time (including mold making) is usually about 2 weeks after the drawing confirmation. Sample production involves many links, including mold design, mold making, material selection, process selection, trial production, sample testing, etc., so the chance of a successful one is about 90%. If it is not successful, the cycle may be significantly prolonged.
3, the number of samples: 5 ~ 10pcs (special circumstances are agreed upon)
4, Drawing modification: Before the drawing is officially confirmed, any modification opinions can be proposed on the drawing. We will modify the drawing within the first time, unlimited times, and will not charge any modification fees. Of course, this may affect the cycle.
5, the following re-sample does not need to re-open mold fee: modify Vo, modify the polarization mode, due to the supplier cause the sample and the buyer to confirm the drawings are inconsistent.
6, the following re-sample or modify the mold after the need to re-open mold fee: the sample and the demand side to confirm the drawings are consistent, but the demand side to modify (size, display patterns, logic, observation direction, etc.) lead to need to re-make the mold.
Section code LCD screen mold note
The perspective and reaction speed are their common characteristics and common differences.
Now people touch the most is the mobile phone LCD screen, collectively referred to as TFT screen, basically can not see there is a range of viewing angle attenuation, and relatively low-end TN, HTN, STN display has a clear perspective difference. The industry's nomenclature: 6H, 9H, 3H, 12H. That is what we mean by 6 o'clock, 9 o'clock, 3 o'clock, and 12 o'clock. Use a hanging clock as a reference - Explain the direction of the viewing angle, 6 points for looking upwards, 3 points for the left side view, 9 points for the right side view, and 12 points for the top view. These points are particularly critical when shopping.
The temperature is also one of the main parameters in the LCD screen. During the customization, the screen factory will send a drawing, which has an essential parameter: "working temperature, storage temperature". When designing, it is necessary to pay attention to this parameter and consider the environment in which the product operates. LCD screen is generally divided into 3-4 ranges, room temperature (0-50 °C) range, wide temperature (-20-75 °C) range, ultra wide temperature (-30-85 °C) range. When the selection is wrong, the following reaction occurs: In the low temperature environment, the display will respond slowly, and there will be a bottom shadow at high temperatures.
3, drive mode and voltage
The drive mode is a setting that matches the drive IC, so you should first select the driver IC before selecting the LCD. There will be a detailed description of the drive IC. Or directly into the display module, you can not consider this item. Industry terms are: duty cycle and bias ratio. As long as these two parameters are provided, the factory will have a solution, and the voltage also needs to be provided.
4, the truth table
Needless to say, this is a form of software programming that needs to identify the address of the LCD.
5, display mode
The effect of the show, the current low-end screen can only be mostly black and white, LCD display principle fully shows that his Bunsen can not shine, so the bottom of the backlight can be seen clearly, so derived positive display mode, negative Mode, fully transparent mode, semi-transparent mode, they can also have many combinations.
In normal circumstances, the positive display mode is black and white, the negative display mode needs to add the bottom backlight backlight color, the semi-transmission mode is the positive display bottom backlight, the full transmission mode has negative and positive display, Most of them belong to the backlit display.
6, connection method
There are many kinds of connection methods for glass devices, such as hot press paper, zebra strips, metal feet, soft cables, and so on.