P‐90: A New PWM Pixel Circuit for Micro‐LED Displaly with 60Hz Driving and 120Hz Lighting

P‐90: A New PWM Pixel Circuit for Micro‐LED Displaly with 60Hz Driving and 120Hz Lighting

The essence of pulse amplitude modulation (PAM) pixel circuit for OLED is voltage driven current which is widely used in market. For micro LED, due to the color shift with the current, PAM pixel circuit is no longer suitable. However, the pulse width modulation (PWM) is voltage driven duty ratio whe...

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Veröffentlicht in:SID International Symposium Digest of technical papers 2020-08, Vol.51 (1), p.1707-1710
Hauptverfasser: Wang, Ting, Chen, Rong, Zhou, Hongbo, Wu, Huangyao, Zhou, Qiufeng, Lai, Guochang, Li, Junyi
Format: Artikel
Sprache:eng
Schlagworte:
backplane
Circuits
CMOS
Color
Electric potential
Light emitting diodes
Lighting
LTPS TFT
Micro-LED
pixel circuit
Pixels
Power consumption
Pulse amplitude modulation
Pulse duration modulation
PWM
Voltage
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Beschreibung
Zusammenfassung:The essence of pulse amplitude modulation (PAM) pixel circuit for OLED is voltage driven current which is widely used in market. For micro LED, due to the color shift with the current, PAM pixel circuit is no longer suitable. However, the pulse width modulation (PWM) is voltage driven duty ratio where the current is fixed and can solve the color shift problem. Thus, a new PWM pixel circuit with CMOS LTPS TFTs for micro‐LED display has been developed in this paper. In addition, the developed PWM circuit can also reduce the power consumption and realize the drive circuit of 60Hz, and LED lighting of 120Hz respectively.
ISSN:0097-966X
2168-0159
DOI:10.1002/sdtp.14227