This brief proposes an active matrix micro-pixelated light-emitting diode (AMLED) display driver to achieve a high luminance uniformity. The proposed AMLED enhances the forward current uniformity of micro-LEDs by compensating for resistance mismatch between micro-pixel circuits. ICs were fabricated using standard 0.18-μm CMOS process with 6-V voltage devices. They assembled micro-LED array having resolution 16 × RGB and measured verify display. average deviation over all 768 pixels was 0.91%...

A driving method of pixel circuit using amorphous indium gallium zinc oxide (a-IGZO) thin-film transistor (TFT) is proposed to improve the image quality active matrix light-emitting diode displays. The employs a diode-connected structure compensate for variation in threshold voltage (Vth) a-IGZO TFT. In addition, adopts negative bias annealing suppress Vth shift. time optimized based on experimental observation minimum After stress 30000 s, measurement results show that shift reduced by...

This paper presents an area-efficient and low-power 12-b successive approximation register/single-slope analog-todigital converter (SAR/SS ADC) for CMOS image sensor (CIS) applications. The number of unit capacitors the proposed SAR/SS ADC is reduced to 1/64th that a conventional SAR using only 6-b capacitor digital-to-analog (DAC) power consumption by sharing analog circuits between SS ADC. In addition, properly operates without any calibration method as it designed be robust inaccuracies...

This article proposes an active-matrix organic light-emitting diode (AMOLED) pixel circuit for mobile displays with high resolution to improve the image quality of display panel. The proposed circuit, which consists six low-temperature polycrystalline silicon thin-film transistors (TFTs) and two capacitors, compensates variations in threshold voltage (Vth) subthreshold slope (SS) driving TFTs at low gray levels. Such compensations are achieved by extending compensation time diode-connection...

This paper proposes a pixel circuit with high resolution and luminance uniformity for organic light emitting diode-on-silicon (OLEDoS) microdisplays. The proposed employs simple structure that consists of four n-channel MOSFETs one capacitor, resulting in resolution. In addition, this compensates the threshold voltage (Vth) variation driving transistor caused by body effect, which increases Vth as source-to-body increases, thus reducing emission current deviation, uniformity. Moreover,...

This brief presents a low-power CMOS image sensor with 14-bit column-parallel two-step (TS) successive approximation (SA) analog-to-digital converters (ADCs). The proposed TS SA ADC adopts pseudomultiple sampling method to reduce the power consumption and area. For implementing ADC, it only uses capacitor digital-to-analog converter of 6 bits rather than 14 bits. multiple also suppresses noise pixel ADC. is fabricated by using 0.13-μm process. measurement results show that temporal 82.7...

This paper proposes an analog front-end (AFE) IC using a multiple-frequency driving method (MFDM). The proposed AFE achieves high signal-to-noise ratio (SNR) by external noise spectrum and locating the frequencies of excitation signals in low-noise regions. In addition, it employs MFDM to increase frame rate simultaneously sending having multiple touch screen panel (TSP). extracts coordinates finger as well coordinates, pressure, tilt angle active stylus with force gauge gyro sensor. were...

In this brief, a successive built-in resistance (BIR) detection, which operates in the constant average current mode, is proposed to achieve fast charging of lithium-ion (Li-ion) battery by accurately compensating for voltage across BIR. addition, low-dropout regulator-based structure adopted implement compact-sized charger without using any extra external components. The fabricated 0.13-μm BCD process technology with 6-V high-voltage CMOS devices, and its measurement result shows that...

This paper proposes a capacitive touch sensing system (CTSS) using an adaptive chopper stabilization (ACS) method to achieve high noise immunity. The proposed ACS quickly detects and adaptively filters out external noises, thereby achieving immunity in the CTSS. To verify method, readout integrated circuit (ROIC) was fabricated 0.35-$\mu \text{m}$ CMOS process technology with 18 V high-voltage devices measured 46-in sensor (CTS). When no noises are induced into CTS, signal-to-noise ratio...

This paper presents an average current control method for a light-emitting diode (LED) lamp driver that achieves highly accurate and removes low-frequency light flicker. The proposed LED accurately maintains forward by precisely adjusting the duration of on- off-times driver. It also flicker regulating without being affected component ac line voltage. In addition, it reduces power consumption eliminating necessity high-voltage sensor or high-side resistor, which causes conduction loss....

This paper proposes a multibit pulsewidth modulated (PWM) delta-sigma (ΔΣ) analog-to-digital converter (ADC) using single-slope (SS) quantizer for CMOS image sensor (CIS). In the proposed ADC, ΔΣ modulation is performed by converting of PWM signal into data an SS quantizer. suppresses random noise multi-sampling operation and reduces area ADC adding ramp to single-bit ADC. The with 12-b resolution was fabricated 0.13-μm CIS process pixel array which has Bayer patterned color filter format...

In this paper, we propose an area-efficient high-resolution resistor-string digital-to-analog converter (R-DAC) with a reverse ordering scheme for active matrix flat-panel display data driver ICs. The proposed R-DAC is implemented in two-stage DAC along DAC-embedded amplifier. reduces the area of R-DAC, which occupies most IC. To verify scheme, 640-channel IC 12-bit was fabricated using 0.18-μm CMOS process 1.8 V and 18 devices. comprises 10-bit 2-bit only 50.1% conventional R-DAC....

This paper presents a low-noise amplifier (LNA) using attenuation-adaptive noise control (AANC) for ultrasound imaging systems. The proposed AANC reduces unnecessary power consumption of the LNA, which arises from useless floor, by controlling floor LNA with respect to attenuation ultrasound. In addition, current feedback source-degenerated input stage variations bandwidth and closed loop gain, are caused AANC. was fabricated 0.18-[Formula: see text] CMOS process. input-referred voltage...

In this paper, a polar coordinate-based touch data extraction (PCTDE) algorithm is proposed to enhance the linearity and accuracy of coordinates for large-sized capacitive screen panels (TSPs) with wide electrode pitch. The PCTDE accurately extracts by calculating distance directional angle between point intersection transmitter receiver electrodes. addition, interference two points in multi-touch reduced decreasing differential rate so that exact can be determined. We evaluated using...

In this brief, a highly power-efficient single-inductor bipolar-output (SIBO) DC-DC converter is proposed for use as the pixel power supply of organic light-emitting diode-on-silicon microdisplays, which are used in virtual reality and augmented applications. The SIBO regulates its negative output voltage (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON</sub> ) using hysteretic skipping to reduce number switching operations, resulting an...

Two simple pixel circuits are proposed for high resolution and image quality organic light-emitting diode-on-silicon microdisplays. The achieve due to structure comprising three n-type MOSFETs one storage capacitor, which integrated into a unit subpixel area of 3 × 9 µm2 using 90 nm CMOS process. improve by compensating the threshold voltage variation driving transistors extending data range. To verify performance circuits, emission currents 24 measured. measured current deviation error A B...

This brief proposes a fast switching current regulator to achieve high dimming ratio of the light-emitting diode (LED) backlight drivers. The proposed employs slewing time reduction method enhance by decreasing rising LED forward current. A six-channel driver was fabricated using 0.35-μm bipolar-CMOS-DMOS process technology which includes an n-type MOSFET with low voltage 5 V and high-side lateral double diffused breakdown 60 V. measured minimum pulsewidth are reduced 4.8 ns 12 ns,...

In this paper, we propose a pixel structure and timing diagram using the block emission (BE) driving method to improve image quality of high-resolution active matrix organic light-emitting diode (AMOLED) displays. The proposed reduces boundary error pattern between blocks by adjusting compensation (comp) signal for threshold voltage variation. test patterns, which include array unit pixels, are designed 10-inch quadruple high-definition resolution format fabricated verify AMOLED measurement...

As the demand for interactive displays continues to increase, capacitive touch systems (CTSs) with stylus-based drawing have become indispensable [1–4]. Passive styli are widely used because of their low-cost implementation, but low SNR and limited expressions [1]. Active gained interest solve these problems [4]. The pressure an active stylus can be expressed using a pressure-to-capacitance transducer [3,4], tilt angle has not been reported yet. In addition, analog front-end (AFE) ICs high...

This letter proposes a fast and highly accurate battery charger for mobile applications. The proposed accurately detects the built-in resistance (BIR) determines transition point from constant-current (CC) to constant-voltage (CV) modes. It then maximizes minimizes durations of CC CV modes, respectively, thus reducing charging time. In addition, controls current (I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">BAT</sub> ) by employing an...

This paper proposes a multi-bit incremental analog-to-digital converter (ADC) based on successive approximation (SA) for column-parallel readout circuits. The proposed ADC suppresses the random noise and enhances resolution by embedding conventional SA with an integrator decimation filter. In addition, operating speed is increased through two-step operations of coarse conversion fine embedded ADC. A residue fitting method adopted to adjust voltage range after conversion. 12-bit was...

We investigated the characteristic variation of an integrated thin-film resistor (TFR), which is composed silicon chromium (SiCr), according to process conditions and its effects on analog circuits. To improve TFR properties, such as temperature coefficient resistance (TCR) mismatch, was examined under various conditions. First, sputtering power annealing were optimized control TCR property. Secondly, etching time dummy pattern enhance mismatch The measured -3.9 ppm/ <sup...

This brief proposes a highly linear digital-to-analog converter (DAC) of the data driver IC for active matrix flat-panel displays (AMFPDs). The proposed 10-bit two-stage DAC is realized with an upper 6-bit decoder and lower 4-bit DAC-embedded amplifier. in first stage selects two adjacent voltages from among reference R-string according to 6-bit. amplifier second employs source degeneration load have output current proportional input voltage, thus achieving consistent transconductance...

This brief proposes a fast transient response hybrid low dropout (LDO) regulator with highly accurate DC voltage for system-on-chip (SoC) applications. The proposed LDO, which consists of the analog and digital LDOs (ALDO DLDO), controller, employs algorithm in controller to control ALDO DLDO so as produce its accurately regulated output voltage. is realized countable bidirectional binary search (CBBS) soft swap switching (SSS) through logic synthesis. CBBS quickly determines coarse-tuning...