Basic performance requirements for Car display screens!

As the automotive industry develops towards "electrification, technology, intelligence, networking, and sharing", the application of new cutting-edge technologies in automobiles will become inevitable. The display screen is the main interface for passengers in the car to obtain vehicle and related information, and will become an important window for immersive cockpit experience human-computer interaction.

In recent years, human-vehicle information interaction has become more efficient. In order to meet the needs of consumers, in-vehicle display screen technology has been continuously upgraded. The upgraded display effect not only attracts the attention of new users but also adds new technical highlights to the car. The emergence of new products must be supported by good performance and technology. So what performance does a good in-vehicle display need to have? Let's take a look!

The world's first rollable display for automobiles developed by Hyundai Mobis. Depending on the driving mode, the screen size can be expanded without space restrictions.

According to the research of some manufacturers, in-vehicle displays must have at least the following basic qualities:

1. High temperature resistance. Since vehicles may travel in different seasons and at different latitudes, in-vehicle displays need to be able to be used normally within a wide temperature range. Therefore, temperature resistance is a basic quality. The current industry requirement is that the display screen should reach -40~85℃ as a whole.

2. Long service life. In short, the car display screen must support at least five years of design and production cycle. Due to vehicle warranty, this period should be extended to 10 years. Ultimately, the service life of the display should be at least the same as the service life of the vehicle.

3. High brightness. It is crucial that the driver can easily read the information on the display screen under different ambient light conditions (from bright sunshine to complete darkness).

4. Wide viewing angle. The driver and passengers (including rear seat passengers) should be able to see the central control display screen.

5. High resolution. High resolution means that the number of pixels per unit area is greater and the overall picture is clearer.

6. High contrast. The contrast value is defined as the ratio of the maximum brightness value (full white) divided by the minimum brightness value (full black). Generally speaking, the minimum contrast value acceptable to the human eye is about 250:1. High contrast is beneficial for seeing the display screen clearly when the light is strong.

7. High dynamic HDR. The quality of the picture display requires a comprehensive balance, especially the real feeling and coordination of the image. This concept is HDR (High Dynamic Range), and its actual effect is that the brighter the moon is, the darker the darker the darker the darker the bright and dark details are well displayed.

8. Wide color gamut. High-resolution displays may need to be upgraded from 18-bit red, green and blue (RGB) to 24-bit RGB to achieve a wider color gamut. High color gamut is a very important indicator for improving display effects

The color fineness and richness of the image with a wide color gamut on the right are much better than those on the left

It can be seen that the larger the area of the triangle, the larger the color gamut index, the richer the color content expressed, and the richer the image content. The larger the area of the triangle, the closer the three vertices are to the edge, that is, the purer the RGB pure color is.

Other features may include:

9. Fast response time and refresh rate. Smart cars, especially autonomous driving, need to collect road information in real time and remind drivers in time at critical times. Fast response and refresh can avoid information transmission lag, which is crucial for warning indicators and navigation functions (such as real-time maps, traffic information updates and backup cameras).

10. Anti-glare and reduce reflection. The in-vehicle display screen provides key vehicle information to the driver, and visibility should not be reduced due to ambient light conditions (especially when the sun is strong during the day). Of course, the anti-glare coating on its surface should not hinder visibility ("flicker" interference needs to be eliminated).

11. Low energy consumption. The significance of low energy consumption is that it can reduce the consumption of vehicle energy, especially for new energy vehicles, more electricity can be used for mileage; in addition, low energy consumption means reducing heat dissipation pressure, which has positive significance for the whole vehicle.

Finally:

Currently, the most widely used in-vehicle display is LCD panel, and innovative display technologies include OLED, Mini LED, Micro LED, etc.

It is difficult for traditional LCD panels to fully meet the above display requirements, and although OLED has other excellent performance, its service life is a hard flaw.

Due to technical limitations, Micro LED is basically unable to achieve mass production. A relatively compromised choice is an LCD display screen with Mini LED backlight, which can improve the picture quality through refined regional dimming.