1-billion-color TFT-LCD TV with full HD format

Kim, Jinho; Choi, Byong‐Deok; Kwon, Oh‐Kyong

doi:10.1109/tce.2005.1561823

Cited by 45 publications

(4 citation statements)

References 10 publications

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“…To suppress the switching errors, several dummy switches are used with their sizes being carefully designed by thorough simulations, as reported in the literature. 6,9) The actual circuit schematics used for the simulations are presented in…”

Section: Simulation and Discussionmentioning

confidence: 99%

Hybrid 8-bit Digital-to-Analog Converter for Mobile Active Matrix Flat Panel Displays Using Low-Temperature Polycrystalline Silicon Thin Film Transistors

Byun

Choi

2007

jjap

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To implement a compact-area 8-bit digital-to-analog converter (DAC) for system-on-panel (SoP) application, a panel DAC concept is proposed to apply a cyclic DAC to low-temperature polycrystalline silicon (LTPS) thin film transistor (TFT) driver circuits, which utilizes a pair of data lines as capacitors for the cyclic DAC. This means that a large part of the DAC circuit is implemented on the pixel area, thus saving the peripheral circuit area for the DAC. Another important impact of the proposed scheme is that we can eliminate the buffer amplifier to drive the capacitive data lines, because the analog voltage of the DAC is produced on the data line itself. However, the capacitances of two data lines should match with a 1% difference for the 8-bit cyclic DAC. The data line capacitance is basically parasitic and is fabricated by wet etching, so such tight matching is almost impossible. Therefore, the use of the hybrid DAC which combines a 6-bit resistor-string DAC and a 2-bit cyclic DAC is a more feasible approach, because the capacitance difference of up to 50% between the two data lines is allowed for the 2-bit cyclic DAC. The area increase in the 8-bit hybrid DAC is limited to 21% compared with that in the 6-bit resistor-string DAC, and the power consumption is about 13.3 mW for a 2-in. quarter video graphic array (qVGA) active matrix organic light emitting diode (AMOLED) panel.

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Section: Simulation and Discussionmentioning

confidence: 99%

Hybrid 8-bit Digital-to-Analog Converter for Mobile Active Matrix Flat Panel Displays Using Low-Temperature Polycrystalline Silicon Thin Film Transistors

Byun

Choi

2007

jjap

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“…It is merely determined by the operating principle of the buffer shown and is compatible with any technologies adopted. When implementing the output buffer with more advanced technology, we just need to simultaneously narrow the length and width of the involved transistors and keep the aspect ratio of them satisfying Equation (9). In this way, the presented output buffer can also work correctly with the advanced technology.…”

Section: Output Buffermentioning

confidence: 99%

“…Furthermore, as the number of columns in the AMOLED panel increases rapidly, it becomes more important to reduce the chip area of DACs as much as possible while maintaining their accuracy and uniformity [8]. Currently, resistor DAC (R-DAC) is widely utilized in AMOLED column drivers due to its distinguished uniformity, which stems from the commonly shared resistor-string for all channels [9,10]. However, the area of R-DAC generally increases exponentially along with the improvement of conversion resolution [11].…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we make the following contributions to alleviate the area redundancy issue of conventional two-stage DACs- (1) We propose a novel two-stage 10-bit DAC design with an internal Currently, resistor DAC (R-DAC) is widely utilized in AMOLED column drivers due to its distinguished uniformity, which stems from the commonly shared resistor-string for all channels [9,10]. However, the area of R-DAC generally increases exponentially along with the improvement of conversion resolution [11].…”

Section: Introductionmentioning

confidence: 99%

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An Area-Efficient 10-Bit Buffer-Reused DAC for AMOLED Column Driver ICs

et al. 2020

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In this paper, we proposed an area-efficient 10-bit digital-to-analog converter (DAC) with buffer-reusing method to dramatically relief the severe area exploding issue in high-definition active-matrix organic light-emitting diode (AMOLED) driver integrated circuits (ICs). In our design, we implement the functionalities of a large number of switches and capacitors in conventional DAC by a compact internal buffer. Furthermore, we minimize the buffer capacity requirement by elaborately reusing the indispensable output buffer in the typical column driver. In this way, we can cut down nearly a half of the decoder-switches and simultaneously reduce the capacitor size from 8 C to 3 C without designing an intricate and power-consuming amplifier separately. A prototype 6-channel column driver employing the proposed buffer-reused DAC was fabricated by 0.35 μm 2P3M BCD (Bipolar, CMOS, DMOS) process and its effective layout area per channel is 0.0429 mm2, which is 42.8% smaller than that of the conventional 10-bit R-C DAC. Besides, the measured differential nonlinearity (DNL) and integral nonlinearity (INL) are 0.514 LSB/0.631 LSB, respectively and the maximum value of inter-channel deviation voltage output (DVO) is 3.25 mV. The settling time within 5.6 μs is readily achieved under 1.5 kΩ-resistance and 100 pF-capacitance load. Measurement results indicate that the proposed buffer-reused DAC can successfully minimize the die area while maintaining other required performances.

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