58.1: A 720‐Channel LCD Source Driver with a 12‐Bit Segmented R‐C DAC

Yoo, Seongjong; Jung, Jiwoon; Nam, Jang-Jin; Seo, Heeyoung; Lee, Kwang-Hee; Song, Yongchul; Ko, Ju-Hyun; Lim, Jung-Pil; Kim, Jihoon; Kim, Beop-hee; Cho, Youngjin; Kim, Jong-seon; Lee, Myung‐Hee

doi:10.1889/1.3069814

Cited by 10 publications

(7 citation statements)

References 5 publications

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“…This is comparable to the results from monolithic ICs, which are less than 8 mV. 23,24 Two types of LUT were prepared, according to the procedure illustrated in Fig. 6(a), and their contents are plotted in Fig.…”

Section: Driver Board Designsupporting

confidence: 79%

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

et al. 2009

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Abstract— Early loss of image uniformity has been a critical drawback of active‐matrix organic light‐emitting‐diode (AMOLED) displays operated in time‐ratio gray‐scale mode. This problem is addressed with an analog calibration technique which measures the voltage across each OLED for a given current and subsequently controls the supply voltage of pixels and the voltage drop across the driving th in‐film transistor (TFT) of each OLED. The uniformity of test cells, which were aged to produce image sticking in a chessboard pattern, were improved. A measure of image sticking, called the extracted image‐sticking value (EISV), was formulated, which is developed and used for the quantitative evaluation of the calibration method. OLED voltages over a range of about 0.35 V were compensated to produce more uniform OLED currents than those before aging. The variation of luminance associated with image sticking was reduced by about 40% for a full‐white image after between 2 and 10 hours of accelerated aging with a constant voltage of 8 V across an OLED.

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Section: Driver Board Designsupporting

confidence: 79%

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

et al. 2009

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“…The cyclic DAC is area efficient for a 10-bit or higher resolution DAC [2]; however, the conversion time can be a serious problem as the bit number increases. Another approach is to use segmented DACs [3][4], where the 12bit DAC is divided into two 6-bit sub-DACs (one for MSB and the other for LSB). Therefore, only two 64-to-1 selectors are required for each DAC.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, only two 64-to-1 selectors are required for each DAC. However, [3] requires ratio capacitors, and is subject to non-monotonic. In addition, the complexity of both DACs can be further reduced.…”

Section: Introductionmentioning

confidence: 99%

P‐41: An Area‐Efficient 12‐Bit Segmented DAC for LCD Driver ICs

Huang

Chou

et al. 2009

Symp Digest of Tech Papers

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“…To solve the trade-off between resolution and area, a 12-bit segmented R-C DAC was introduced. 6 In this paper, a 12-bit segmented R-C DAC with a small area is described and analyzed in detail. are used to include the proposed 12-bit segmented R-C DAC.…”

Section: Introductionmentioning

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

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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.

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58.1: A 720‐Channel LCD Source Driver with a 12‐Bit Segmented R‐C DAC

Cited by 10 publications

References 5 publications

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

Reducing image sticking in AMOLED displays with time‐ratio gray scale by analog calibration

P‐41: An Area‐Efficient 12‐Bit Segmented DAC for LCD Driver ICs

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

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