10‐bit source driver with resistor‐resistor‐string digital‐to‐analog converter

Abstract— A 12‐bit segmented R‐C DAC to support a linear gamma curve has been proposed and fabricated in a 720‐channel LCD source driver with a 16‐V 1‐poly 3‐metal high‐voltage CMOS process. The proposed DAC has a global resistor string and sample‐and‐hold buffers. A MSB voltage selected by the upper 6 bits of input data and a LSB voltage selected by the lower 6 bits of input data are summed by using a sample‐and‐hold operation with offset cancellation in the proposed DAC. The measured DNL was less than 0.3 LSB, and the output voltage deviation was less than 3 mV in all gray levels. Although two sample‐and‐hold buffers were adopted to operate alternatively, the die size was as small as 24.9 mm2, which was only an 8.3% increase compared to that of a conventional 8‐bit 720‐channel source driver. Because of its good performance with small area, the proposed DAC can be a good low‐cost solution for a 10‐bit TV system.

show abstract

“…At this moment, the voltage on the node x, V X , can be written as Eq. (4), (4) where V OS is the offset voltage.…”

Section: Sample-and-hold Buffermentioning

confidence: 99%

A 12‐bit segmented resistor‐capacitor digital‐to‐analog converter for a display driver IC of a large TFT‐LCD panel system

et al. 2009

View full text Add to dashboard Cite

show abstract

“…This makes the R-DAC impractical for use in column driver ICs for high color depth displays. In recent years, several area-efficient two-stage DAC architectures including resistor-resistor-string DACs (RR-DACs) [5,6] and embedded DACs [7,8] have been developed for high definition display. Owing to the reduction in bit number of R-DAC, the area of two-stage DAC is efficiently decreased.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, the bit number of R-DAC in the presented DAC is reduced from 8 to 6, so its area is efficiently reduced. Compared with the two-stage RR-DACs, which are reputed the most area-effective and thus the most promising candidate for column driver applications [5], this architecture features high uniformity and low static power consumption since intermediate unity-gain buffers are not required. Consequently, it is appropriate for high resolution column driver.…”

Section: Introductionmentioning

confidence: 99%

A compact-sized 10-bit two-stage DAC for AMOLED column driver ICs

Huang

Tian

Zhang

et al. 2015

IEICE Electron. Express

View full text Add to dashboard Cite

An optimized compact-sized 10-bit DAC with one-voltage selector for AMOLED column driver ICs is proposed in this paper. By rearranging the architecture of the switch-capacitor in the proposed design, the number of decoder switches is cut in half. In addition, a compact 8-bit two-stage DAC with two-voltage selector is also presented. The simulation and experiment results show that the column drivers adopting the compact 8-bit DAC and 10-bit DAC occupy only 53.7% and 76.3% of the area required for the driver adopting the conventional 8-bit R-DAC. The measured DNL/ INL is 0.44LSB/0.68LSB for the 8-bit DAC and 0.126/0.256LSB for the 10-bit DAC, respectively. Moreover, settling time within 6.43 µs is achieved under 1.5 kΩ-resistance and 100 pF-capacitance load, hence the proposed column driver is suitable for Full-HD AMOLED displays.

show abstract

“…Several researches on small area and high resolution DAC have been recently made [4][5]. A linear segmented DAC divides the input digital code into three sub digital codes, and each of the divided code is used to select the corresponding reference voltage from the resistor string [4].…”

Section: Introductionmentioning

confidence: 99%

“…However, this DAC occupies a large area of R-string because various reference voltages are selected by only one R-string. A resistor-resistor-string DAC [5] is introduced to reduce the chip area. This DAC consists of 1 st stage resistor-string DAC and 2 nd stage resistor-string DAC without having the intermediate unity gain buffer which isolates the parallelconnected resistor-string.…”

Section: Introductionmentioning

confidence: 99%

A small area 10-bit linear gamma DAC with voltage adder for large-sized active matrix flat panel displays

Bae

Seol

Kwon

et al. 2014

2014 International Symposium on Integrated Circuits (ISIC)

Self Cite

View full text Add to dashboard Cite

This paper proposes a 10-bit linear gamma digitalto-analog converter (DAC) of source driver ICs for large-sized active matrix flat panel displays (AMFPDs). The proposed DAC employs the voltage adder to reduce the area of source driver IC. The voltage adder not only reduces the size of 7-bit DAC to about half by adding the fixed one least significant bit (LSB) voltage but also quickly settles the output to the target voltage by its pre-charged output. To verify the performance of the proposed DAC, the simulation and layout are performed with a 55-inch full high-definition active matrix organic light emitting diodes (AMOLED) display. The simulation result of the proposed DAC shows INL of 0.98 LSB and DNL of 0.69 LSB. The proposed DAC uses only 57.3% of number of transistors compared to the conventional 10-bit DAC with a 3-bit embedded amplifier, which results in reducing the area of source driver IC for AMFPDs significantly. Keywords-AMOLED, digital-to-analog converter (DAC), large-sized AMFPD, small area DAC, source driver IC, voltage adder.

show abstract

10‐bit source driver with resistor‐resistor‐string digital‐to‐analog converter

Cited by 16 publications

References 7 publications

A 12‐bit segmented resistor‐capacitor digital‐to‐analog converter for a display driver IC of a large TFT‐LCD panel system

A 12‐bit segmented resistor‐capacitor digital‐to‐analog converter for a display driver IC of a large TFT‐LCD panel system

A compact-sized 10-bit two-stage DAC for AMOLED column driver ICs

A small area 10-bit linear gamma DAC with voltage adder for large-sized active matrix flat panel displays

Contact Info

Product

Resources

About