Analysis of 1.99-inch rectangular LCD display
I. Basic parameters and specifications
Size definition
Diagonal length: 1.99 inches (about 5.05 cm), the length and width of the rectangular screen need to be calculated in combination with the specific ratio (common ratios such as 4:3, 16:9, circular adaptation, etc.).
Resolution: Common specifications are:
240×240 pixels (square, commonly used when adapting to circular dials)
240×320 pixels (16:10 ratio, suitable for displaying text and simple graphics)
Other customized resolutions (such as special needs of manufacturers).
Brightness and contrast: The typical value is 200-500 cd/m² (nits), the contrast ratio is about 500:1-1000:1, and higher brightness (such as 800 nits or more) is required for outdoor use.
Physical properties
Thickness: Usually 1.5-3 mm (including backlight module), suitable for compact devices.
Interface type: SPI, I2C, Parallel, RGB, etc., which need to match the communication protocol of the main control chip.
Backlight type: LED backlight, supports monochrome (such as white, blue) or full color, and power consumption is about 5-50 mW (depending on brightness and size).
2. Application scenarios
Smart wearable devices
Smart watches, bracelets: display time, heart rate, notifications, etc., requiring low power consumption and visibility under strong light.
Example: When adapting to a circular dial, the rectangular screen can hide the edges through UI design to simulate a circular display area.
Consumer electronics and small appliances
Electronic cigarettes, thermometers, blood glucose meters: display numerical values and status information, support monochrome or color icons.
Smart home panel: control buttons and status feedback, requiring touch function (can be matched with capacitive touch screen).
Industrial and medical equipment
Instruments: real-time data monitoring (such as voltage, flow), requiring high reliability and wide temperature operation (-20℃~70℃).
Medical equipment: simple waveform display or parameter setting interface, which must comply with medical-grade certification (such as FDA, CE).
Internet of Things (IoT) terminals
Smart sockets, sensor nodes: display device status, power, etc., low power consumption design (such as current < 1 mA in sleep mode).
