73.2: A Novel TFT Pixel and Driving Scheme of Electrically‐ Suppressed‐Helix FLC for Active Matrix Flat Panel Display

Ho, Tsz Kin; Tseng, Man Chun; Srivastava, Abhishek Kumar; Zhou, Wei; Lei, Lei; Chigrinov, Vladimir G.; Wong, Man; Kwok, Hoi Sing

doi:10.1002/sdtp.10407

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…The pulse width modulation driving scheme is proposed to control the gray scale that can be controlled by the duty cycle of the bright frame. [11][12] Furthermore, to avoid the damage of FLC material from the DC charge accumulation, a display frame must be followed by an inverted frame (dark frame). Fig.…”

Section: Methodsmentioning

confidence: 99%

40.1: Invited Paper: Electrically Suppressed Helix Ferroelectric Liquid Crystals (FLCD) for modern LCDs

Srivastava

Lei

Kwok

2019

Symp Digest of Tech Papers

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Section: Methodsmentioning

confidence: 99%

40.1: Invited Paper: Electrically Suppressed Helix Ferroelectric Liquid Crystals (FLCD) for modern LCDs

Srivastava

Lei

Kwok

2019

Symp Digest of Tech Papers

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“…Therefore, the ON‐time duration is analog and linearly depended on data. Alternating the data voltage will effectively change the ON–OFF ratio of the FLC state within the flame period, and this eventually generate gray levels in time domain perceived by human eyes …”

Section: Pixel Circuit Design For Active Matrixmentioning

confidence: 99%

“…Recently, a novel electro‐optical mode for ferroelectric liquid crystal (FLC) named as electrically suppressed helix ferroelectric liquid crystal (ESHFLC) has been developed at Hong Kong University of Science and Technology . By controlling the anchoring energy comparable but less than the elastic energy of the helix of the FLC, we can confine the FLC in the ESHFLC mode, which is primarily characterized by very high optical quality and fast switching response.…”

Section: Introductionmentioning

confidence: 99%

Active matrix field sequential color electrically suppressed helix ferroelectric liquid crystal for high resolution displays

et al. 2018

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In this article, we disclose a 3-inch 250ppi active matrix field sequential color electrically suppressed ferroelectric liquid crystal (ESHFLC) display. ESHFLC's ultra-fast response time (~10µs at 6.67V/µm) enables the display resolution to be tripled via field sequential color technique. Photo-alignment technology provides ESHFLC with optimal anchoring energy which contributes to a high contrast ratio over 10K:1. Specific 3T1C pixel circuit is designed to convert the analog signal to pulse width modulation. Thus the field sequential color ESHFLC display is achieved on LTPS TFT panel. With the delivered prototype, we successfully demonstrate the active matrix FSC ESHFLC integrated display system. We believe this display may replace IPS or FFS in the near future for portable mobile market. Moreover, high resolution FSCESHFLC can find more applications in emerging virtual reality displays.

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“…The traditional analog amplitude modulation method generates gray levels based on the amplitude of the drive current [16]. With the development of microdisplay, the digital pulse width modulation (PWM) method has been used, which generates different duty ratios by modulating pulse width to form gray levels [17][18][19][20][21][22][23]. Stretched exponential decay (SED) [24][25][26][27][28][29][30] model can predict the OLED luminance degradation by fitting various coefficients related to OLED materials.…”

Section: Introductionmentioning

confidence: 99%

Duty ratio drive prediction model of lifetime degradation for organic light emitting diode‐on‐silicon microdisplay

Mu,

Ji,

Gong

et al. 2023

Luminescence

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A duty ratio drive prediction (DRDP) model of luminance degradation for organic light emitting diodes (OLED) microdisplay is proposed in this paper. The traditional stretched exponential decay (SED) model is not applicable for OLED driven by duty ratio. The DRDP model introduces the duty ratio as the variables affecting the lifetime of OLED. By fitting the undetermined coefficients with the measured luminance data, the quantitative relationships among the initial luminance, duty ratio, and OLED lifetime are obtained. Meanwhile, the model quantifies the phenomenon of spontaneous luminance recovery, which occurs when OLED switches from bright to dark. Finally, the DRDP model is used to compensate the luminance degradation of OLED driven by duty ratio. The experimental results show that the average prediction accuracy of DRDP model for white, red, green, and blue (W/R/G/B) OLED degradation trend is 0.9623. The average prediction accuracy of W/R/G/B OLED lifetime is 0.6119, which is greater than that of SED model. The lifetime is extended by 89.83% after compensation.

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73.2: A Novel TFT Pixel and Driving Scheme of Electrically‐ Suppressed‐Helix FLC for Active Matrix Flat Panel Display

Abstract: Abstract

Cited by 6 publications

References 8 publications

40.1: Invited Paper: Electrically Suppressed Helix Ferroelectric Liquid Crystals (FLCD) for modern LCDs

40.1: Invited Paper: Electrically Suppressed Helix Ferroelectric Liquid Crystals (FLCD) for modern LCDs

Active matrix field sequential color electrically suppressed helix ferroelectric liquid crystal for high resolution displays

Duty ratio drive prediction model of lifetime degradation for organic light emitting diode‐on‐silicon microdisplay

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