Liquid Crystal Display Drivers

Cristaldi, David J.R.; Pennisi, S.; Pulvirenti, Francesco

doi:10.1007/978-90-481-2255-4

Cited by 80 publications

(57 citation statements)

References 3 publications

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“…From TE measurements, it could be seen that samples change the polarization of transmitted light and that this variation occurs even when the wavelength is not in the OA spectrum range of 5A dye. This is due to system birefringence [23]. Based on Table 2, it is clear that for the S00 sample, when the incident light is at 457 nm and right circularly polarized, the transmitted light is linear horizontally polarized due to the high value of S 1 with positive signal.…”

Section: Ellipsometry -Principles and Techniques For Materials Characmentioning

confidence: 95%

“…This clearly shows an asymmetry in the molecular ordering along the optical way, induced by liquid crystal molecular alignment, the exception in this case being the S00 sample. As a result, there are changes in the light polarization transmitted by this type of system [23]. Table 1 shows S 1 , S 2 and S 3 parameters normalized by S 0 obtained during EE measurements and its polarizations.…”

Section: Nematic Liquid Crystal E7™ Doped With a Benzothiadiazole Dermentioning

confidence: 99%

See 1 more Smart Citation

Achromatic Ellipsometry: Theory and Applications

Therézio¹,

Dalkiranis²,

Vieira³

et al. 2017

Ellipsometry - Principles and Techniques for Materials Characterization

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In the present chapter, the theory and some applications of Achromatic Ellipsometry, including transmittance, absorbance, and emission, are presented. The new methodology introduced here comprises the calculation of Stokes parameters using Fourier series analysis. Light polarization was determined by calculating the polarization degree, anisotropy, asymmetry parameters, and rotational and ellipsometry angles. The nematic liquid crystal E7™ doped with 4,7-bis{2-[4-(4-decylpiperazin-1-yl) phenyl]ethynyl}-[2,1,3]-benzothiadiazole (5A) within twisted and parallel structures, was used to illustrate the applications for this technique, that has been shown to be an innovative and versatile tool to correlate the photophysics with materials structure.

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Section: Ellipsometry -Principles and Techniques For Materials Characmentioning

confidence: 95%

Section: Nematic Liquid Crystal E7™ Doped With a Benzothiadiazole Dermentioning

confidence: 99%

Achromatic Ellipsometry: Theory and Applications

Therézio¹,

Dalkiranis²,

Vieira³

et al. 2017

Ellipsometry - Principles and Techniques for Materials Characterization

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“…To optimize R T , the output frequency of each chip is measured according to TC [4:0] and temperature, and TC[4:0], which generates the smallest frequency variation with respect to temperature, is selected. The optimized TC[4:0] is programmed to the non-volatile memory in the digital circuits of the MDDI, where the non-volatile memory is a dedicated block in a MDDI to store critical parameters such as gamma curve data and the reference voltages for analog blocks [6]. However, as R T is changed according to TC[4:0], I 1 , I 2 , and α are changed, and thereby T OSC is varied.…”

Section: Proposed Relaxation Oscillatormentioning

confidence: 99%

A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs

Chung¹,

Hong²,

Kwon³

2016

JSTS:Journal of Semiconductor Technology and Science

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Abstract-A 70 MHz temperature-compensated onchip CMOS relaxation oscillator for mobile display driver ICs is proposed to reduce frequency variations. The proposed oscillator compensates for frequency variation with respect to temperature by adjusting the bias currents to control the change in delay of comparators with temperature. A bandgap reference (BGR) is used to stabilize the bias currents with respect to temperature and supply voltages. Additional temperature compensation for the generated frequency is achieved by optimizing the resistance in the BGR after measuring the output frequency. In addition, a trimming circuit is implemented to reduce frequency variation with respect to process. The proposed relaxation oscillator is fabricated using 45 nm CMOS technology and occupies an active area of 0.15 mm 2 . The measured frequency variations with respect to temperature and supply voltages are as follows: (i) ±0.23% for changes in temperature from -30 to 75°C, (ii) ±0.14% for changes in V DD1 from 2.2 to 2.8 V, and (iii) ±1.88% for changes in V DD2 from 1.05 to 1.15 V.

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“…So, two basic offset cancellation structures with their simple structure are commonly used in LCD source driver, which are chopper and auto-zero [8]- [14]. However, the output buffers in these two structures are still too complicated due to their wide input and output range.…”

Section: Introductionmentioning

confidence: 99%

“…Usually in LCD source driver uses metal-in-metal (MIM) capacitor as storage capacitor that it won't increase the area of source driver. The simple structure of auto-zero is also used in some prior researches for offset cancellation [8], [13]. …”

Section: Introductionmentioning

confidence: 99%

Low Offset and High Slew Rate Buffer amplifier for LCD Application

Mishra¹,

Raikwar²

2015

IJCA

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The proposed buffer achieves low offset and high slew rate in proposed circuit NMOS folded cascode operation amplifier is used instead of rail to rail operation amplifier, use of only NMOS folded cascode operation amplifier reduces the number of MOS used in circuit and using auto zero negative feedback will provide full swing for positive and negative feedback polarity pixel, and to decrease the offset a current distributed load is used which increases DC gain of operational amplifier and as DC gain increases it reduces offset voltage and increases slew rate with same bias current used in folded and summing stage of operational amplifier. The proposed circuit is simulated and verified in LT-spice and Microwind simulation tool using 350nm CMOS TSMC foundry with 3.3 V supply voltage the offset calculated is around .2mV and slew rate is 14V/µs.

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Liquid Crystal Display Drivers

Cited by 80 publications

References 3 publications

Achromatic Ellipsometry: Theory and Applications

Achromatic Ellipsometry: Theory and Applications

A 70 MHz Temperature-Compensated On-Chip CMOS Relaxation Oscillator for Mobile Display Driver ICs

Low Offset and High Slew Rate Buffer amplifier for LCD Application

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