A New Compensation Method for Emission Degradation in an AMOLED Display Via an External Algorithm, New Pixel Circuit, and Models of Prior Measurements

Lee, Kuei-Yu; Hsu, Yen-Ping; Chao, Paul C.-P.; Chen, Wei-Dar

doi:10.1109/jdt.2013.2292555

Cited by 29 publications

(23 citation statements)

References 18 publications

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“…In a relatively stable environment, OLED luminance degradation is mainly influenced by thermal gradient and drive current rather than other extrinsic factors. The existing methods to extend lifetime degradation mainly focused on external circuit compensation, which requires additional sensor circuits to detect the degradation of OLED . And internal compensation has strict requirements of well‐designed new pixel circuits such as 5T1C or 4T0.5C .…”

Section: Introductionmentioning

confidence: 99%

“…The existing methods to extend lifetime degradation mainly focused on external circuit compensation, which requires additional sensor circuits to detect the degradation of OLED. [18][19][20][21][22] And internal compensation has strict requirements of well-designed new pixel circuits such as 5T1C or 4T0.5C. 23,24 Other researches on host material can also extended OLED lifetime by suppressing exciton quenching and strengthening the stability of radical cations and anions.…”

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confidence: 99%

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Influence of ambient temperature on OLED lifetime and uniformity based on modified equivalent lifetime detection

Fan

Zhang

2019

J Soc Info Display

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The ambient temperature can affect the OLED heat dissipation and aggravate the luminance degradation. Based on temperature‐related equivalent lifetime detection, a luminance compensation algorithm without internal or external sensing circuits is proposed and the influence of ambient temperature on lifetime and display uniformity is studied. First, the parameters of luminance degradation curves at any ambient temperature are calculated according to the relationship between accelerate degradation factor n and ambient temperature T, which is determined by the measured luminance degradation curves at ambient temperature 25°C, 45°C, and 80°C. Second, luminance compensation is carried out by increasing drive current according to the estimated luminance degradation influenced by temperature. Furthermore, compensation iterations m, compensation goal value Lgoal, and compensation origin value Lorigin are optimized to obtain a better lifetime extension at different ambient temperature. The simulated and experimental results indicate that the lifetime extensions considering the influence of ambient temperature at 0°C, 25°C, 45°C, 60°C, and 80°C are 29.7%, 28.1%, 18.7%, 18.9%, and 11.6%. Meanwhile, after displaying an image of the International Electrotechnical Commission (IEC) 62087 for 90 hours, the luminance uniformity of OLED increase to 96.0%, 94.0%, 97.2%, 97.2%, and 98.6%, which is a significant improvement compared with it of regardless the influence of the ambient temperature.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Influence of ambient temperature on OLED lifetime and uniformity based on modified equivalent lifetime detection

Fan

Zhang

2019

J Soc Info Display

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“…It is a research hotspot in the field of display technology, and it is regarded as the future of next generation display devices. However, image sticking is one of the key issues which restricts the development of OLED [2].…”

Section: Introductionmentioning

confidence: 99%

P‐13.6: The Improvement of OLED Image Sticking Based on Motion Detection

Sun

Fan

Wang

et al. 2018

Symp Digest of Tech Papers

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An improvement method of OLED image sticking based on motion detection without additional circuit units is proposed. Images are divided into static images, mixed images, and moving images by comparing the image luminance among different frames. In this method, the static image is moved and its luminance is reduced. As for the mixed image, its luminance is reduced by varying proportions in different areas. When it is a moving image, the luminance of pixels is reduced. The simulation results show that the improvement can effectively improve OLED image sticking by using the image sticking evaluation method proposed. As for static images, the improvement percentage is 55.05%. When it comes to mixed images, the improvement in static areas is 14.29% and it is 3.29% in motion areas. As for moving images, the improvement percentage is 7.35%.

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“…However, the compensation pixel circuits [2,3,4,5,6] are generally somewhat more complicated than the conventional pixel circuits composed of two transistors and one capacitor (2T-1C), resulting in the reduction of aperture ratio. Moreover, the external compensation techniques [7,8,9] require highly complex hardware, which could lead to higher costs. Furthermore, their compensation techniques are difficult to be adopted in digitally driven OLED panels [10].…”

Section: Introductionmentioning

confidence: 99%

Switching power supply circuit with voltage-drop compensation for AMOLED displays

Kim

Han

2016

IEICE Electron. Express

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A power supply circuit that compensates for the voltage drop in the large-sized AMOLED display panel is presented. The voltage drop, which degrades luminance uniformity, is directly detected, and the detected value is then fed back to the controller circuit to adaptively adjust the power supply voltage in order to minimize the voltage drop. The validity of the proposed technique was verified by experimental results; the two-fold improvement was achieved in terms of the measured voltage drop. As a result, the measured luminance uniformity was also significantly enhanced.

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A New Compensation Method for Emission Degradation in an AMOLED Display Via an External Algorithm, New Pixel Circuit, and Models of Prior Measurements

Cited by 29 publications

References 18 publications

Influence of ambient temperature on OLED lifetime and uniformity based on modified equivalent lifetime detection

Influence of ambient temperature on OLED lifetime and uniformity based on modified equivalent lifetime detection

P‐13.6: The Improvement of OLED Image Sticking Based on Motion Detection

Switching power supply circuit with voltage-drop compensation for AMOLED displays

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