Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

Lin, Chih-Lung; Lai, Po-Cheng; Chang, Jui‐Hung; Chen, Sung-Chun; Tsai, Cheng-Han; Koa, Jein-Lun; Cheng, Minquan; Shih, Li-Wei; Hsu, Wei-Chou

doi:10.1109/ted.2021.3067854

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The oxide TFT and the OLED models are verified by the experimental data [8,33], which are shown in Figure 4. The values of the design parameters are shown in Table 1; the range of the values is reasonable, which is consistent with the previous pixel circuit applications [11,19,20,27,32,34]. The values of the design parameters are shown in Table 1; the range of the values is reasonable, which is consistent with the previous pixel circuit applications [11,19,20,27,32,34].…”

Section: Resultssupporting

confidence: 84%

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A Pixel Circuit for Compensating Electrical Characteristics Variation and OLED Degradation

Wei

Chu

et al. 2023

Micromachines

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In recent years, the active-matrix organic light-emitting diode (AMOLED) displays have been greatly required. A voltage compensation pixel circuit based on an amorphous indium gallium zinc oxide thin-film transistor is presented for AMOLED displays. The circuit is composed of five transistors–two capacitors (5T2C) in combination with an OLED. In the circuit, the threshold voltages of both the transistor and the OLED are extracted simultaneously in the threshold voltage extraction stage, and the mobility-related discharge voltage is generated in the data input stage. The circuit not only can compensate the electrical characteristics variation, i.e., the threshold voltage variation and mobility variation, but also can compensate the OLED degradation. Furthermore, the circuit can prevent the OLED flicker, and can achieve the wide data voltage range. The circuit simulation results show that the OLED current error rates (CERs) are lower than 3.89% when the transistor’s threshold voltage variation is ±0.5V, lower than 3.49% when the mobility variation is ±30%.

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Section: Resultssupporting

confidence: 84%

“…The TFTs' threshold voltage variation and mobility variation are ±0.5 V and ±30%, respectively [9,14,28]. The OLED model is equivalent to a TFT and a COLED in parallel [22,27,32]. The oxide TFT and the OLED models are verified by the experimental data [8,33], which are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 70%

A Pixel Circuit for Compensating Electrical Characteristics Variation and OLED Degradation

Wei

Chu

et al. 2023

Micromachines

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show abstract

“…However, the non-uniform LTPS TFT characteristics, such as the threshold voltage (V TH ) shift and carrier mobility variations, are serious consequences of the crystallization process [ 8 , 9 ]. Furthermore, the LTPS TFT generally suffers from a high leakage current due to its polycrystalline structure [ 10 , 11 ]. In contrast to LTPS TFTs, oxide TFTs feature superior uniformity and an extremely low leakage current [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

Fan,

Lin,

Liu

2023

Micromachines

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A 6T1C pixel circuit based on low-temperature polycrystalline oxide (LTPO) technology for portable active-matrix organic light-emitting diode (AMOLED) display applications is proposed in this paper. For superior high-end portable applications including 4K high resolution and high PPI (pixels per inch), the proposed pixel circuit employs a single storage capacitor and signal sharing switch-control design and provides low-voltage driving and immunity to the IR-drop issue and OLED degradation. Furthermore, the threshold voltage and mobility-compensating capabilities are improved by both compensation mechanisms, which are based on a negative feedback system, and mobility-related compensation parameters. Simulation results reveal that threshold voltage variations of ±0.33 V in the driving thin-film transistors can be well sensed and compensated while the maximum OLED current shift is 4.25%. The maximum variation in OLED currents within all gray levels is only 1.05% with mobility variations of ±30%. As a result, the proposed 6T1C pixel circuit is a good candidate for portable AMOLED display usage.

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Active‐Matrix Electroluminescent Displays

Guo¹,

Deng²,

Nathan³

2022

Advances in Semiconductor Technologies

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Leakage-Prevention Mechanism to Maintain Driving Capability of Compensation Pixel Circuit for Low Frame Rate AMOLED Displays

Cited by 14 publications

References 22 publications

A Pixel Circuit for Compensating Electrical Characteristics Variation and OLED Degradation

A Pixel Circuit for Compensating Electrical Characteristics Variation and OLED Degradation

An Active-Matrix Organic Light-Emitting Diode Pixel Circuit Featuring Mobility Compensation for Portable Applications

Active‐Matrix Electroluminescent Displays

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