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How to choose a TFT LCD module?
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01/11/2022You may not believe that, as a senior practitioner in the field of LCD display for many years, I sometimes feel difficult to choose when facing many similar TFT display modules.
Obviously, my professional knowledge and understanding of the industry products are enough for me to select a satisfactory TFT display module product. However, we should pay attention to the fact that there are too many products and manufacturers on the market,
The products produced are often mixed, and the technical requirements and testing standards of different countries are very different. All these factors are the real factors that lead to the difficulty in selecting products.
In view of this, I would like to share with you my more than ten years of experience in this TFT display module industry without reservation. I hope I can give you some decision support on the choice of purchasing staff.
Experience 1: TFT display module screen power consumption
Although the power consumption of TFT display is relatively small, the TFT display module with low power consumption index is more important in some specific fields, especially in the products pursuing low power consumption index.
The power consumption of TFT display module depends on the display type, backlight brightness requirements, interface driver type and other related factors. Generally speaking, TFT display module with large size and high backlight brightness will consume more energy.
But this is not absolute. For example, after setting the same backlight brightness for two computer display screens of the same size, if a display screen adopts high resolution and high refresh setting, and B display screen adopts low resolution and low refresh setting,obviously, the power consumption of display a is higher than that of display B.
Experience 2: TFT display module screen size
Although theoretically, the size of TFT display module display can be customized according to customer needs. But each product has its own specific product parameters.
These product parameters are generally popular and recognized in the industry. For example, the commonly used aspect ratio of computer screens is 16:9; this is the most popular aspect ratio in an industry. If there is a company producing a screen size of very weird 12:9;
So many of the things involved in its screen conflict with the existing mature supply chain. This is clearly not the right choice. The same is true for TFT displays. When you select TFT display module, you need to use the select the most versatile and matching size models on the market.
Experience 3: TFT display module screen brightness
Because TFT display module has a wide range of applications, their working scenarios are very different. Different working scenes will have different light intensity, which is a challenge for TFT display module display.
In order to better display the contents loaded on the TFT display module, TFT display module may adopt ways to improve the brightness of the rear projection light source or enhance the optical enhancement function, such as circular polarizer, o-film (contrast enhancement) and anti reflection coating, etc.
The application of these advanced technologies enables LCD to adapt to most indoor and outdoor lighting environments. However, it should be noted that these technologies and the way of optical enhancement will affect the power consumption of TFT display module to a certain extent.
Experience 4: TFT display module screen visual perspective
In physics, there is a term called light reflection. The most common two kinds of light reflection in life are specular reflection and diffuse reflection. We all know that objects with rough or irregular surfaces are easy to find, while smooth objects are sometimes difficult to find.
You can’t see because the light is specular on a smooth surface, so some of the light can’t get into your eyes. Similar phenomena will occur on the TFT display module. At a certain angle, we can’t see the contents on the screen,
Even at this time, the screen is playing wonderful content. This angle is often referred to as the viewing angle of TFT display module. Different LCD display technology will lead to a big difference in the visual angle, so when you are in the
When choosing the TFT display module display screen, you must understand clearly before making a decision.
Experience 5: TFT display module screen contrast
Contrast refers to the measurement of different brightness levels between the brightest white and the darkest black in the light and dark area of an image. The larger the difference range is, the greater the contrast is. The smaller the difference range is, the smaller the contrast is. A good contrast ratio of 120:1 can easily display vivid and rich colors.
When the contrast ratio is as high as 300:1, it can support all levels of color. So we can come to the conclusion that the higher the contrast of TFT display module is, the more color richness of picture quality can be reflected, which is beneficial to TV and computer
After all, no one wants to watch videos with unclear quality.
Experience 6: TFT display module screen equipment interface
TFT display module, as the medium of content output, needs a certain signal input interface to receive the external signal to be displayed. The common TFT display module interface devices are RGB, LVDS, Mipi, SPI, parallel MCU and direct driver.
You may be curious, why can’t we unify the external signal input standards to set up a TFT display module device interface? Obviously, this is a very good problem, and many scientists and technicians are trying to solve it.
But what you need to know is that TFT display module, as the downstream of the product industry, cannot change some inherent rules of the upstream industry. This is like our popular metric units, but there are still many countries in the world using British units as the measurement standard of weighing instruments.
Experience 7: TFT display module screen Compatibility
In the final analysis, the reason for the compatibility problem is that the development of science and technology is so fast that the products of the previous generation are not out of date, but they have gradually failed to keep up with the pace of the new generation of products. You might say that giving up the last generation of products will focus all your energy
Isn’t it better on a new generation of products? Obviously, this is not a well thought out issue. Every product has its life cycle, and every life cycle stage of this product will be invested a lot of capital and other investment. Obviously not
A simple sentence to give up can be completed. Therefore, you may face the external signal that TFT display module needs to receive, which may be more advanced or backward than the current device, but you must display the content perfectly.
At this time, the compatibility of TFT display module is worth your attention.
Experience 8: TFT display module operating temperature
I believe that most TFT display module displays can perform very well at room temperature, but what about under extremely harsh conditions? Is the TFT display module broken in extremely cold environment? Will there be downtime in extremely hot environment?
When TFT display module is transferred from low-temperature environment to high-temperature environment, will the circuit board short-circuit and screen atomization occur due to water vapor condensation in low-temperature environment due to temperature rise? In the common TFT display module display screen
In the products, the general working environment temperature is 0-50 ℃; however, this obviously can not meet our needs for a wider range of harsh use environment requirements, so the new generation of TFT display module products have been able to adapt to most of the harsh climate environment after technical upgrading.
Experience 9: technical reference standards
Different countries have different production standards and test indicators for TFT display module. For example, in China, its test standard is 《SJ / T 11343-2006 – General specification for digital television LCD displays》；《SJ / T 11340-2006 – General specification for LCD front projectors》; 《SJ / T 11248-2001 – liquid crystal and solid state display devices Part 3-1: liquid crystal display (LCD) cells Blank detail specification》
It is precisely because the technical requirements and testing indicators of TFT display module vary greatly in different countries, so when you purchase TFT display module display products, you should be more careful to identify them. For the screen failure rate, duration of use
Color contrast, power loss, screen viewing angle and other important factors that can affect TFT display module display are deeply understood and inquired, so as to avoid unnecessary loss in the use process.
Experience 10: TFT display module screen price
Everyone knows that cheap is not good, but there are always some people who want to buy the best products with the least money, which is obviously unrealistic. From the perspective of TFT display module screen manufacturers, only products with reasonable profit margin will go further
The investment in technology research and development or the improvement of production scale and efficiency will further reduce the product price. On the contrary, if a TFT display module screen manufacturer simply relies on low prices to develop the market, because the price is too low, it does not more funds for new product development and technological innovation, then their products can only be constantly outdated and inferior quality. In the field of TFT display module screen production for more than 10 years, I have been in contact with the well-developed TFT display module manufacturers
All of them have reasonable profit margin in terms of price. Those who have low price market shock have already quit the market of TFT display module for various reasons. So, there’s no pie in the sky, but when the price is very low and looks very attractive,
What you should consider is not to buy immediately, but to stay away from them immediately.
