Gamma Correction of Pulse Width Modulation With Current Uniformization for AM-OLEDs

Kimura, Mutsumi; Suzuki, Daisuke; Sawamura, Shigeki; Kato, Masakazu; Nishinohara, Daisuke

doi:10.1109/jdt.2011.2173294

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…How much the gray scale levels can be increased depends on how precisely Vdata can be generated. Moreover, gamma correction is also possible by revising the shape of the sweep wave, although it is not used here.…”

Section: Pulse‐width Modulation With Current Uniformizationmentioning

confidence: 99%

“…We are proposing pulse‐width modulation with current uniformization (PWM‐CU) for AM‐OLEDs, which is a combination of the PWM and current uniformization techniques. This driving method can simultaneously solve the luminance unevenness and image sticking due to the characteristic deviations and degradations of the driving transistors and OLEDs.…”

Section: Introductionmentioning

confidence: 99%

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Pulse‐width modulation with current uniformization for AM‐OLED micro‐displays on Si LSI chips

et al. 2019

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We have developed pulse-width modulation (PWM) with current uniformization for active-matrix organic light-emitting diode (AM-OLED) micro-displays on Si large-scale integration (LSI) chips. This driving method can simultaneously solve luminance unevenness and image sticking due to characteristic deviations and degradations of driving transistors and OLEDs. With the use of circuit simulation, it is verified that the PWM with current uniformization (PWM-CU) can simultaneously achieve precise gray scale and exceedingly improve luminance uniformity. Moreover, an actual panel is designed and fabricated, where the OLEDs are layered on the Si LSI chip. It

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Section: Pulse‐width Modulation With Current Uniformizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pulse‐width modulation with current uniformization for AM‐OLED micro‐displays on Si LSI chips

et al. 2019

Self Cite

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“…Hence, most of the panel supply voltage is applied to the OLED, then the current through the OLED is determined by the supply voltage, and the negative effect of the characteristics of the driving TFT is minimized. As methods of PWM driving, analog PWM (A‐PWM) 17–21 and digital PWM (D‐PWM) 22 have been proposed for AMOLED displays. In A‐PWM, an analog voltage is changed into a pulse width in a pixel circuit.…”

Section: Introductionmentioning

confidence: 99%

A digital driving method using pulse‐density modulation with a random dither matrix for higher motion image quality

Usui

Nakajima²,

Shiga

2021

J Soc Info Display

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We propose a new digital driving technique using pulse‐density modulation (PDM) with a random dither matrix for evenness of luminance uniformity and higher motion image quality. As a digital driving technique, pulse‐width modulation (PWM) is conventionally used for active‐matrix organic light‐emitting diode (AMOLED) displays in order to improve luminance uniformity. However, in PWM driving, it is difficult to realize high‐frame‐rate driving for improving motion image quality. On the other hand, it is considered that PDM driving method is effective to obtain high motion image quality because of non‐frame‐refreshing property. In the present paper, we proposed a PDM driving technique using a random dither matrix and evaluated the relationship between the display image quality and the driving frequency in the proposed method through simulations. As a result, it is confirmed that good image quality can be obtained by using a blue‐noise mask as a random dither matrix at a practical driving frequency. Moreover, we demonstrated the proposed technique using an actual AMOLED panel.

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32‐4: Late‐News Paper: OLED display Gamma LUT optimization based on Principal Component Analysis

Kim

Chang

Youn

et al. 2020

Symp Digest of Tech Papers

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The high‐end OLED display has multiple gamma Look‐Up Tables(LUT) to minimize any noticeable luminance changes occuring in driving mode transition. We analyze redundancy of LUTs and propose visually lossless LUT compression based on Principal Component Analysis (PCA). It reduces costly One‐Time‐Programmable(OTP) memory size, typically used for LUT storage in Driver IC, by more than 50% with less than 0.1 Mean Square Error(MSE) for 10 bit LUTs.

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Gamma Correction of Pulse Width Modulation With Current Uniformization for AM-OLEDs

Cited by 5 publications

References 17 publications

Pulse‐width modulation with current uniformization for AM‐OLED micro‐displays on Si LSI chips

Pulse‐width modulation with current uniformization for AM‐OLED micro‐displays on Si LSI chips

A digital driving method using pulse‐density modulation with a random dither matrix for higher motion image quality

32‐4: Late‐News Paper: OLED display Gamma LUT optimization based on Principal Component Analysis

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