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Frequently asked questions in OLED display design


1. What voltage is VDD, VDDIO/VCC?
VDD is the logic drive voltage of the OMED screen. Different drive ICs have different voltage ranges, such as SSD1305, which ranges from 2.4 to 3.5V.
VDDIO is the logic voltage of the IO port, which is generally flat at the high level of the data line.
VCC is the driving voltage of the screen of the OLED module. Different screens have different voltage values. (Some specifications also write VCC as VPP)
2. What is the relationship between power consumption and lifetime in brightness?
The power consumption is directly related to the number of pixels lit up. Compared with LCDs with backlights, the power consumption is much smaller. For the same product, the lifetime is directly related to the brightness.
3. What are the advantages of OLED?
Compared with LCD, OLED has active illumination, no backlight, no viewing angle problem, light weight, thin thickness, high contrast, fast response, wide temperature range, soft display, strong shock resistance, simple process, etc. advantage.
4. Why is OLED wide temperature?
OLED luminescent materials are solid, and the material properties are stable at different ambient temperatures. Liquid crystal is a substance between liquid and solid. When the temperature is too high, it will become liquid. When it is too low, it will become solid. The physical form will change, which will seriously affect the display.
5. What is the difference between the OLED driver interface and the LCD?
OLED drive interface is more extensive, not only supports 8080/6800 parallel port, but also supports SPI, I2C and other current LCD common interfaces, which is very convenient in computer connection.
6. What is the difference between OLED software and LCD?
The software flow of OLED is basically the same as LCD. Chenyang technicians will provide initialization code for customers to help customers quickly embed development.
7. What should I pay attention to in the OLED structure design process?
Because the screen substrate glass is relatively thin, structural positioning is required in the design process, the display screen is fixed by PC8 card position or structure card position, and the corresponding shockproof foam is added to enhance the seismic performance of the product.
8. What problems should OLED need to pay attention to when designing the drive boost circuit?
Generally, the load capacity of the boost IC is greater than the maximum power consumption of the screen. It is recommended that the peripheral circuit design be completed by the Chenyang technician.
9. How to adjust the brightness of OLED display?
Adjust the hardware drive voltage and software code value to adjust the brightness of the OLED display. Please consult the Zopin-tech technician for details.