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Core Selection Principle of TFT LCD Shape
The selection of TFT LCD Shape should follow the principle of “matching product demand + balancing cost and performance”: first, determine the suitable TFT LCD Shape according to the product’s structural design, application scenario and display content characteristics; then, on the premise of meeting the functional requirements, select the standard screen or partial customized screen as much as possible to control the cost; only when there is a rigid design requirement, consider the full customized TFT LCD Shape, and fully evaluate the development cycle and order quantity requirements before cooperation.
Standard Screens:
Standard screen is the most traditional and widely used TFT LCD Shape, characterized by conventional aspect ratios, with 4:3 and 16:9 being the mainstream. As a mature TFT LCD Shape, it has the advantages of perfect industrial chain, mature production technology and relatively low procurement cost, which is the first choice for most standard electronic products.
In terms of performance, the resolution of standard TFT LCD screens covers from QVGA to 4K, and supports a variety of wide viewing angle technologies and standardized interface protocols (RGB, LVDS, MIPI, etc.), which can meet the display needs of different clear degrees and signal transmission requirements.
Application scenarios: Televisions, computer monitors, medical equipment, POS terminals and other consumer electronics and industrial products with regular structural design and high requirements for cost performance.
Round Screen:
Round screen is a highly personalized TFT LCD Shape that breaks through the rectangular constraint, and its biggest advantage is to bring a strong visual focus and unique design sense to the product, which is very suitable for intelligent wearable and vehicle-mounted products pursuing appearance and interactive experience.
This TFT LCD Shape has high technical requirements in the production and application stage: the edge pixel display needs special driving algorithm processing, the bonding process is more complex than the standard screen, and the corresponding production and procurement cost is higher. When selecting round screen TFT LCD, it is necessary to focus on the matching degree between the diameter of the effective viewing area and the structural opening of the product; it is recommended to select IPS full-view panel to ensure the viewing effect; in the later UI design, the font needs to be enlarged to adapt to the circular display area characteristics.
Application scenarios: Smart watches, smart speakers, automotive dashboards and other products that focus on design sense and personalized interaction.
Bar Display:
Bar display, also known as strip display, is an elongated TFT LCD Shape with an aspect ratio greater than 3:1, which is specially designed for the display of long and narrow information such as progress bars, status lists and real-time data streams.
This TFT LCD Shape is equipped with a variety of flexible interface options (RGB, MCU, SPI, etc.), and there are high-brightness versions available, which can adapt to the display needs of outdoor or strong light environments. In the selection stage, it is necessary to confirm the matching between the length of the effective display area and the product structural opening, and select capacitive or resistive touch solutions according to different application scenarios.
Application scenarios: POS systems, server operation panels, audio equipment, smart home control systems and other products that need to display single-line or long and narrow information.
Square Displays:
Square display is a TFT LCD Shape with an aspect ratio close to 1:1, which is characterized by symmetrical display effect, and is very suitable for the presentation of grid data, icon-based interaction and retro-style display interfaces.
The resolution of this TFT LCD Shape is diversified, including 128×128, 240×240, 480×480 and other common specifications, and the interface is mainly SPI or MCU, which is easy to match with small and medium-sized electronic product control boards. For selection, it is necessary to pay attention to the compatibility between the external dimensions of the screen and the product structural components; in terms of brightness, 300–400 cd/m² is sufficient for indoor applications, and 450 cd/m² or higher high-brightness models are recommended for outdoor handheld devices.
Application scenarios: Retro game consoles, industrial instruments, electronic cigarettes, power banks and other products that require symmetrical display or grid data presentation.
Customized TFT LCD Shape:
When the above standard TFT LCD Shape cannot meet the personalized structural and display requirements of products, customized TFT LCD Shape is the optimal solution, which supports the design of various irregular shapes such as rounded rectangles, octagons and racetrack shapes, and can be integrated with curved cover plates and various touch technologies to realize the perfect fit between the screen and the product structure.
It should be noted that full customization of TFT LCD Shape has high upfront costs, with NRE fees ranging from tens of thousands to hundreds of thousands of US dollars, and there are requirements for minimum order quantity and long development cycle. As a cost-effective alternative, partial customization is available, such as modifying the FPC, backlight or cover plate silkscreen of the standard screen, which has lower cost and shorter development cycle. Full customization is only recommended when the product design has rigid and irreplaceable requirements for TFT LCD Shape.
FAQs about TFT LCD Shape
Q1: Why can’t the same size square and round TFT LCD Shape be used interchangeably?
Even if the diagonal size is the same (e.g., 1.54 inches), the square and round TFT LCD Shape cannot be used interchangeably, the core reason is the huge difference in the effective display area (AA area) and driver matching:
- AA area mismatch: The AA area of a 1.54-inch square TFT LCD is about 27.72mm × 27.72mm, while the AA area of a 1.54-inch round TFT LCD is within a circle with a diameter of about 39mm (the actual value is subject to the factory design). If the structural opening is circular and a square screen is installed, or the opening is square and a round screen is installed, the display content will be seriously blocked.
- Driver IC mismatch: The initialization code of the driver IC of the two TFT LCD Shapes is different; the round screen needs special mapping in the display RAM to hide the invalid pixels at the four corners, and the square screen does not have this driving logic.
Q2: What requirements should be met for TFT LCD Shape used in outdoor strong sunlight environment?
For TFT LCD Shape applied in outdoor strong sunlight, the core is to optimize the two key parameters of brightness and viewing angle, and the specific requirements are as follows:
- Brightness index: The brightness of the screen must reach at least 800 cd/m², and it is better to select the model with 1000 cd/m² to resist the interference of strong light and ensure the readability of the display content.
- Viewing angle panel: Must select IPS wide viewing angle panel; ordinary TN panels are prone to grayscale inversion or even complete illegibility when viewed from the side in sunlight.
- Optional optimization: If the product cost permits, select the TFT LCD with full lamination technology, which can significantly reduce the light reflection caused by the air layer between the layers of the screen and greatly improve the outdoor display effect.