OLED (organic light-emitting diode) is an important member of flat panel displays (FPD).Due to its many merits such as high luminance

low drive voltage

high response speed and variety of emission colors

etc.

OLED attracts worldwide attention in the fields of science and industry.At the present time progress in making long life and high stability has been made

but drive circuit for OLED is not very perfect

and chips for OLED are very simple

and the functions of chips are very simple.Meanwhile the functions of drive circuit chips for LCD are very perfect and the price is very cheap

so we determine to design a drive circuit for TFT-OLED with TFT-LCD drive chips.Firstly

the article compares the driving principle of TFT-LCD and the one of TFT-OLED

and finds that two driving principles are very resemble

so it is possible changing the drive chip of TFT-LCD and making it drive TFT-OLED.Then we choose two types of TFT-LCD chips fabricated by Samsung.One is the 120/128 channels TFT-LCD gate driver S6C0655

the other is the 6 bit 480 channels source driver S6C0671.After analyzing the chips

we find that the driving timing

display data

output driving voltage and currency of the chips meet the need of our color TFT-OLED completely.The voltage on liquid crystal pixel is alternating voltage

but the voltage on OLED pixel is direct voltage

so we adjust the input on POL pin

let it maintain low voltage always.We choose 80 channels of S6C0655 and 240 channels of S6C0671 because the standard of our color display is 64×3×80.At last

we design a circuit with a piece of MCU

a piece of S6C0655

a piece of S6C0671

a piece of ROM and some periphery circuits.ROM

S6C0655 and S6C0671 are controlled by MCU.Display data are stored in ROM.When the circuit is working

MCU gets the data from ROM and transfers them to S6C0671 and transfers shift pulse to S6C0655 synchronously.