We all know that OLED driving methods are classified into passive OLED (PMOLED) driving mode and active OLED (AMOLED) driving mode. Passive OLED is a voltage-driven type. The driving method is relatively simple. The driving current determines the gray level. In small size and common display products, the resolution and image quality are good, but to achieve large size, reduce power consumption and extend battery. When using time, you must consider using an active OLED driver. Active OLEDs are current-driven, which are better in current rectification than passive OLEDs, and are less prone to leakage. When low-temperature polysilicon (Poly-si) TFT technology is used at the same time, the current can generate a small TFT with low impedance, which meets the requirements of large-size and large-screen OLED displays.
In general, the OLED complete drive display system, in addition to the matrix display composed of pixel unit circuits, should also include the driver IC (row, column control / drive circuit), microcontroller control circuit.
A complete OLED drive display system
Today, Xiaobian will tell you about the mainstream OLED driver solutions (including power drivers, display drivers, etc.) on the market today.
First, Texas Instruments LCD / OLED display biasing scheme
TPS65632 three-output AMOLED display power evaluation module
On the AMOLED display solution, Texas Instruments offers an efficient, low-power, high-performance optimized AMOLED bias portfolio. Ultra-small solution sizes can be achieved by selecting the correct current rating, output voltage and sequence timing.
Texas Instruments currently offers an integrated line of AMOLED (Active Matrix Organic Light Emitting Diodes) products ranging from 1-inch wearable product solutions to notebook screen sizes.
Texas Instruments OLED display bias power driver recommended solution:
OLED driver power supply - featured devices:
TPS65651: Triple (AVDD, ELVSS, ELVDD) AMOLED Bias Supply for Medium Form Factor
TPS65632: Triple (AVDD, ELVSS, ELVDD) AMOLED Bias Supply for Small Form Factor
TPS65631W: Dual (ELVSS, ELVDD) AMOLED Bias Supply for Wearable Smartwatch Applications with Screen Sizes Less Than 3"
Bias power example:
TPS65632 (three-way output AMOLED display power supply)
Description: The TPS65632 is designed to drive an Active Matrix Organic Light Emitting Diode (AMOLED) display that requires three power rails (VPOS, VNEG, and AVDD). The device integrates a boost converter, an inverting buck-boost converter, and a boost converter for VPOS, VNEG, and AVDD, all of which are suitable for battery-powered products. The digital control pin (CTRL) allows the negative output voltage to be set in digital steps. The TPS65632 features new technology to provide excellent line and load regulation.
characteristic:
· 2.9V to 4.5V input voltage range
· Boost Converter 1 (VPOS)
- 4.6V output voltage
- 0.5% accuracy (25°C to 85°C)
- Dedicated output sense pin
Comparison of similar parameters:
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