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An Area-Efficient 10-Bit Buffer-Reused DAC for AMOLED Column Driver ICs
摘要： In this paper, we proposed an area-efficient 10-bit digital-to-analog converter (DAC) with buffer-reusing method to dramatically relief the severe area exploding issue in high-definition active-matrix organic light-emitting diode (AMOLED) driver integrated circuits (ICs). In our design, we implement the functionalities of a large number of switches and capacitors in conventional DAC by a compact internal buffer. Furthermore, we minimize the buffer capacity requirement by elaborately reusing the indispensable output buffer in the typical column driver. In this way, we can cut down nearly a half of the decoder-switches and simultaneously reduce the capacitor size from 8 C to 3 C without designing an intricate and power-consuming amplifier separately. A prototype 6-channel column driver employing the proposed buffer-reused DAC was fabricated by 0.35 μm 2P3M BCD (Bipolar, CMOS, DMOS) process and its effective layout area per channel is 0.0429 mm2, which is 42.8% smaller than that of the conventional 10-bit R-C DAC. Besides, the measured differential nonlinearity (DNL) and integral nonlinearity (INL) are 0.514 LSB/0.631 LSB, respectively and the maximum value of inter-channel deviation voltage output (DVO) is 3.25 mV. The settling time within 5.6 μs is readily achieved under 1.5 k?-resistance and 100 pF-capacitance load. Measurement results indicate that the proposed buffer-reused DAC can successfully minimize the die area while maintaining other required performances.
关键词： AMOLED displays,output buffer,column driver,digital-to-analog converter (DAC)
更新于2025-09-23 15:19:57
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Bulk-Accumulation Oxide-TFT Backplane Technology for Flexible and Rollable AMOLED Displays: Part II
摘要： In the second of a two-part series on a new backplane technology for flexible and rollable AMOLED displays, the author describes a system built on a bulk-accumulation (BA) amorphous indium-gallium-zinc-oxide (a-IGZO) TFT.
关键词： a-IGZO TFT,Rollable AMOLED Displays,Bulk-Accumulation Oxide-TFT,Flexible AMOLED Displays
更新于2025-09-19 17:13:59
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[IEEE 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - Kyoto, Japan (2019.7.2-2019.7.5)] 2019 26th International Workshop on Active-Matrix Flatpanel Displays and Devices (AM-FPD) - New External Compensated Circuit to Achieve Uniform OLED Luminance for High-Resolution AMOLED Displays
摘要： This work proposes a simple-structure pixel circuit composed of low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) and external threshold voltage (VTH) compensation circuit shared by whole row for active-matrix organic light-emitting diode (AMOLED) displays. This proposed circuit combines parallel addressing scheme and voltage-programming method to increase compensation time for accurately detecting threshold voltage variations of driving TFT, and the voltage drop (I-R drop) in power line. Simulation results show that the relative emission current error rates are below 2.93 % and 2.62 % when variations of VTH are ±0.5 V and VDD I-R drop is ±0.5 V, respectively, verifying that the novel pixel design has great potential for use in high resolution AMOLED displays.
关键词： LTPS-TFTs,AMOLED displays,I-R drop,threshold voltage,external compensation
更新于2025-09-11 14:15:04