Image quality enhancement in AMOLED microdisplay for mobile projectors

Choi, Byong‐Deok; Park, In Soo; Kim, J.S.; Lee, Sung‐Jin; Bae, Byung Seong

doi:10.1109/tce.2011.5955161

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…With the advantages of high contrast ratio, fast optical response time, wide view angle, low power consumption and portable feature, organic light emitting diode on silicon (OLEDoS) is an advantageous choice to achieve high image quality microdisplays [1][2][3][4][5][6]. 0.5-inch Quad-VGA and 1.25-inch wide-Quad-XGA OLEDoS microdisplays were developed in recent years [6].…”

Section: Introductionmentioning

confidence: 99%

P‐27: A Novel Pixel Circuit with Threshold Voltage Variation Compensation in Three‐Dimensional AMOLED on Silicon Microdisplay

Zeng

Zhang

et al. 2019

Symp Digest of Tech Papers

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A novel pixel driving circuit for high resolution and high image quality organic light emitting diode on silicon three-dimensional microdisplays is proposed in this paper. The pixel circuit is composed of four P-channel MOSFETs and one capacitor. By sharing the data line and power line, it compensates the threshold voltage ( ℎ ) variation of the driving transistor and then improves the image quality and operating speed. This pixel circuit is verified by SMIC 0.18 μm BCD process, and it is integrated into a pixel unit of 4*4.5. From post-layout simulation, within ± of ℎ variation, the emission current deviation ranges only from -0.56% to 0.50% under 240 Hz frame rate, which is -18.4% to 22.3% in the traditional 2T1C pixel circuits.

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Section: Introductionmentioning

confidence: 99%

P‐27: A Novel Pixel Circuit with Threshold Voltage Variation Compensation in Three‐Dimensional AMOLED on Silicon Microdisplay

Zeng

Zhang

et al. 2019

Symp Digest of Tech Papers

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“…Unlike conventional displays implemented on polycrystalline silicon or amorphous silicon backplanes using a thin‐film transistor process, OLEDoS microdisplays are implemented on single crystalline silicon backplanes using a CMOS process. Thus, a display system including a data driver, gate driver, timing controller, and DC–DC converter can be integrated into a single chip …”

Section: Introductionmentioning

confidence: 99%

“…Thus, a display system including a data driver, gate driver, timing controller, and DC-DC converter can be integrated into a single chip. [1][2][3][4] To improve the reality of virtual reality and augmented reality, high resolution and high image quality OLEDoS microdisplays are required. For high resolution, the OLEDoS pixel circuit should be simple to be integrated into a unit subpixel area of tens of μm 2 .…”

Section: Introductionmentioning

confidence: 99%

Simple pixel circuits for high resolution and high image quality organic light emitting diode-on-silicon microdisplays with wide data voltage range

Hong

Kwak

et al. 2016

Jnl Soc Info Display

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-Two simple pixel circuits are proposed for high resolution and high image quality organic light-emitting diode-on-silicon microdisplays. The proposed pixel circuits achieve high resolution due to simple pixel structure comprising three n-type MOSFETs and one storage capacitor, which are integrated into a unit subpixel area of 3 × 9 μm 2 using a 90 nm CMOS process. The proposed pixel circuits improve image quality by compensating for the threshold voltage variation of the driving transistors and extending the data voltage range. To verify the performance of the proposed pixel circuits, the emission currents of 24 pixel circuits are measured. The measured emission current deviation error of the proposed pixel circuits A and B ranges from À2.59% to +2.78%, and from À1.86% to +1.84%, respectively, which are improved from the emission current deviation error of the conventional current-source type pixel circuit when the threshold voltage variation is not compensated for, which ranges from À14.87% to +14.67%. In addition, the data voltage ranges of the proposed pixel circuits A and B are 1.193 V and 1.792 V, respectively, which are 2.38 and 3.57 times wider than the data voltage range of the conventional current-source type pixel circuit of 0.501 V.

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“…The Chinese company, OLEID, released their 800 × 600 pixel resolution OLED microdisplay to the public in 2010 [22]. Other related works can be found in [23,24].…”

Section: Introductionmentioning

confidence: 99%

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

et al. 2012

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The digital pixel driving scheme makes the organic light-emitting diode (OLED) microdisplays more immune to the pixel luminance variations and simplifies the circuit architecture and design flow compared to the analog pixel driving scheme. Additionally, it is easily applied in full digital systems. However, the data bottleneck becomes a notable problem as the number of pixels and gray levels grow dramatically. This paper will discuss the digital driving ability to achieve kilogray-levels for megapixel displays. The optimal scan strategy is proposed for creating ultra high gray levels and increasing light efficiency and contrast ratio. Two correction schemes are discussed to improve the gray level linearity. A 1280×1024×3 OLED-on-silicon microdisplay, with 4096 gray levels, is designed based on the optimal scan strategy. The circuit driver is integrated in the silicon backplane chip in the 0.35 μm 3.3 V-6 V dual voltage one polysilicon layer, four metal layers (1P4M) complementary metal-oxide semiconductor (CMOS) process with custom top metal. The design aspects of the optimal scan controller are also discussed. The test results show the gray level linearity of the correction schemes for the optimal scan strategy is acceptable by the human eye.

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Image quality enhancement in AMOLED microdisplay for mobile projectors

Cited by 5 publications

References 16 publications

P‐27: A Novel Pixel Circuit with Threshold Voltage Variation Compensation in Three‐Dimensional AMOLED on Silicon Microdisplay

P‐27: A Novel Pixel Circuit with Threshold Voltage Variation Compensation in Three‐Dimensional AMOLED on Silicon Microdisplay

Simple pixel circuits for high resolution and high image quality organic light emitting diode-on-silicon microdisplays with wide data voltage range

Optimal scan strategy for mega-pixel and kilo-gray-level OLED-on-silicon microdisplay

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