9.1: A 3.5‐inch OLED Display using a 4‐TFT Pixel Circuit with an Innovative Pixel Driving Scheme

Kageyama, Hiroshi; Akimoto, Hidetoshi; Ouchi, Takayuki; Kasai, Naruhiko; Awakura, Hiroki; Tokuda, Naoki; Sato, Toshihiro

doi:10.1889/1.1832214

Cited by 19 publications

(6 citation statements)

References 2 publications

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“…Pixel circuits in the prototyped AMOLED panel can control gamma characteristics for respective RGB colors. 6 When the CD-DAC circuit needs to do so, the reference lines should be tripled (192 lines). In this case, the height of the circuit cell is doubled or less, not tripled, and the height of the driver circuit can be about 4.5 mm.…”

Section: Specificationsmentioning

confidence: 99%

Compact and power‐saving polysilicon data driver with common‐decoder DA converter (CD‐DAC)

Kageyama¹,

Miyamoto²,

Akimoto³

et al. 2006

J Soc Info Display

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A common-decoder architecture for a data-driver circuit fabricated by using a polysilicon process has been developed. The architecture achieves a compact circuit and low-power consumption. In application to an integrated polysilicon data driver for small-sized displays, this architecture reduces the area of the data driver by removing the vertical bus lines that occupy a large area. It also suppresses the power consumption of the data bus by reducing the number of driven lines in the data bus during word-to-word transitions from six to two. By using a conventional 4-µm design rule, we fabricated an active-matrix OLED (AMOLED) panel with an integrated six-bit data-driver circuit with 384 outputs. The driver circuit had a height of 2.6 mm and a pitch between output lines of 84 µm. The maximum power consumption of the driver was only 5 mW, i.e., 3.8 mW for logic-data transfer and 1.2 mW for reference-voltage source. Furthermore, we also fabricated an active-matrix LCD (AMLCD) panel including driver circuits of the same type as the integrated elements. Six-bit full-color images were successfully displayed on both panels.

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Section: Specificationsmentioning

confidence: 99%

Compact and power‐saving polysilicon data driver with common‐decoder DA converter (CD‐DAC)

Kageyama¹,

Miyamoto²,

Akimoto³

et al. 2006

J Soc Info Display

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“…5V for most other circuits) then this circuit will show around a 50% reduction in display power consumption at the beginning of the display life. In reference [4] a low power consumption pixel circuit is shown but this does not have the differential ageing correction capability of the circuit shown here.…”

Section: ( )mentioning

confidence: 99%

35.2: Improved Optical Feedback for AMOLED Display Differential Ageing Compensation

Fish

Deane

Shannon

et al. 2004

Symp Digest of Tech Papers

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“…1 Regarding the problem of image non-uniformity, we proposed a driving scheme refered to as clamped inverter driving at the 2003, 2004, and 2005 SID Symposia, and in the Journal of the SID. [2][3][4][5][6] Clamped inverter (CI) driving is a type of constant-anodevoltage (CV) driving, so it also achieves low power consumption and peak luminance. For the other problem of aging, we suggested a luminance compensation that increases the anode voltage when the OLED-display luminance deteriorated at SID '05.…”

Section: Introductionmentioning

confidence: 99%

Anode‐voltage‐control circuit for compensation of luminance deterioration

Kasai¹,

Kudo²,

Ishii³

et al. 2009

J Soc Info Display

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Abstract— An external driving circuit that has realized long lifetime, power‐consumption control, and peak luminance for organic light‐emitting diode (OLED) displays have been developed. This circuit realizes an effective method for constant‐anode‐voltage (CV) driving refered to as clamped inverter (CI) driving. The feature of CV driving is to achieve low‐power consumption compared with constant‐anode‐current (CC) driving and to control the power consumption and peak luminance according to the image because display luminance can be easily changed by controlling the anode voltage. On the other hand, CV driving has the problem that luminance deterioration appears to be serious compared with that of CC driving because the current of the OLED element decreases according to usage time. To cope with this, a lifetime compensation circuit that has increased the anode voltage so that it compensates for the luminance deterioration has been developed. This circuit can compensate not only the decrease in current but also the decrease in luminance at a constant current that CC driving cannot. However, increasing the anode voltage causes an increase in stress on the OLED element. The influence of stress on OLED lifetime was verified. As a result, it was confirmed that this circuit can extend the lifetime by 32% even if the anode voltage is increased, causing stress on the OLED structure.

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9.1: A 3.5‐inch OLED Display using a 4‐TFT Pixel Circuit with an Innovative Pixel Driving Scheme

Cited by 19 publications

References 2 publications

Compact and power‐saving polysilicon data driver with common‐decoder DA converter (CD‐DAC)

Compact and power‐saving polysilicon data driver with common‐decoder DA converter (CD‐DAC)

35.2: Improved Optical Feedback for AMOLED Display Differential Ageing Compensation

Anode‐voltage‐control circuit for compensation of luminance deterioration

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