How to choose horizontal or vertical LCD screens, suggestions for hardware engineers - choose the right main control CPU.

      The choice of horizontal or vertical screens should take into account the user's usage habits and the application scenarios of the device. For example, mobile phones are usually used more vertically, but some videos or games may require horizontal screens. Shenzhen Hongjia specializes in the production of 1.14-inch to 10.1-inch display screens and matching touch screens. We have a relatively complete range of horizontal and vertical screen sizes, high and low resolution options, many standard interfaces, and also accept customer customization services.

      Regarding the impact on the CPU, this part may require understanding of screen resolution, refresh rate, and drive mode. The different resolutions of horizontal and vertical screens may affect the processing burden of the CPU. For example, a high-resolution screen requires more data processing, which may increase the CPU load. In addition, if the screen supports adaptive rotation, the CPU may need to process the rotated image data, which will also consume certain resources.

     The next thing to consider is the potential needs of users. They may be designing a product, such as a smart watch, a car screen, or an industrial control panel. At this time, the choice of screen direction will affect the user experience and hardware configuration. Users may be concerned about how to optimize performance with limited resources, or ensure that the selected screen direction does not cause CPU overload.

     Some technical details also need to be confirmed, such as whether the screen resolution is variable, whether software or hardware support for rotation is required, and whether the main control chip has sufficient graphics processing capabilities. For example, if the screen is fixed, the direction of choice depends on the installation location; if it is rotatable, the resolution may need to be adjusted dynamically, which may have additional overhead for the CPU.

      The choice of horizontal and vertical LCD screens needs to take into account the following factors, and its impact on the main control CPU chip also needs to be analyzed in combination with specific scenarios:

I. The core difference between horizontal and vertical screens

1. Resolution difference

Horizontal screens (such as 1920×1080) usually have more horizontal pixels and are suitable for scenes where content width is prioritized (such as videos and web pages).

Vertical screens (such as 1080×1920) have higher vertical pixels and are suitable for reading applications (such as mobile phones and e-books).

2. Field of view

Horizontal screens can display wider content at the same size and reduce the frequency of horizontal scrolling.

Vertical screens are suitable for one-handed operation or small space display (such as in-vehicle central control and wearable devices).

3. Interaction logic

Horizontal screen interface elements are often arranged horizontally (such as toolbars arranged horizontally), while vertical screens tend to be stacked vertically (such as navigation bar sidebars).

2. Impact on the main control CPU

1. Graphics rendering load

Direct impact of resolution: If the horizontal screen has a higher resolution (such as 4K horizontal screen vs 1080p vertical screen), the GPU/CPU needs to process more pixel data, which may lead to increased power consumption.

Rotation processing overhead: If the screen is physically fixed but the software supports rotation (such as transforming the screen by rotating the matrix), the CPU needs to calculate the rotated coordinates additionally, which slightly increases the amount of calculation.

2. Memory usage

High-resolution horizontal screens require a larger frame buffer (Frame Buffer), which may occupy more RAM and indirectly affect the CPU cache efficiency.

3. Driver compatibility

Some low-power MCUs (such as the ARM Cortex-M series) need to adapt to screen drivers with specific resolutions. Forcibly using non-standard resolutions may cause performance degradation or abnormalities.

3. Hardware design suggestions

1. Hardware matching:

Check whether the GPU performance of the main control chip (such as Mali-G series vs Adreno) can smoothly process the target resolution;

Choose a screen that supports auto-rotation to reduce CPU intervention.

2. Software optimization:

Dynamically adjust the UI layout direction to avoid invalid rendering caused by fixed direction;

Use dual-core CPU division of labor (such as one core processing display and the other core running business logic).

       In short, there is no absolute advantage or disadvantage between horizontal screen and vertical screen, and it needs to be weighed based on actual scenarios (user habits, content type, cost constraints). The impact on the CPU is mainly reflected in resolution, rotation processing and driver complexity. Reasonable planning of software and hardware configuration can minimize performance bottlenecks.