Heat distribution in AMOLEDs

Cok, Ronald S.; Coleman, J. Burgess; Leon, Felipe; Mazzarella, James

doi:10.1889/1.2121069

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…Various approaches have been evaluated and developed. For example, metal shunting grids may be placed on the anode to improve heat distribution [28,35]; an additional metal plate may be attached to the substrate as a heat sink or a thicker cathode may be used [36]; and replacing the conventional cover glass with thin film encapsulation also enhances heat dissipation [37,38]. In general, employing highly efficient PHOLEDs to reduce non-emissive exciton decay and optimizing the layout design to minimize Joule heating are the two key factors that enable low temperature operation of large-area OLED lighting panels, and long lifetime.…”

Section: Resultsmentioning

confidence: 99%

Thermal behavior and indirect life test of large-area OLED lighting panels

et al. 2014

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In this work, we studied the thermal behavior and addressed the challenges of life testing of large area OLED devices. In particular, we developed an indirect method to accurately calculate the life time of large-area OLED lighting panels without physically life-testing the panels. Using small area OLEDs with structures identical with the tested panels, we performed the life tests at desired driving current densities at different temperatures and extracted the relationship between junction temperature and the lifetime for the particular device. By measuring the panel junction temperature during operation under the same current density and using the life time measured on small area test devices, we determine the lifetime of the panels based on the thermal dependence. We test this methodology by predicting the life time of white PHOLED panels and then physically testing the panels. The typical result for the lifetime to 80% of the initial luminance (LT80) of the panel at a constant dc current density of 10 mA/cm 2 (3800 cd/m 2 ), was predicted to be 526 hours in good agreement with the actual life-test at 10 mA/cm 2 of 512 hrs. This good agreement, confirmed in different experiments, validates this novel technique as a practical life time predictor of large-area OLED lighting panels in a time saving manner.

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Section: Resultsmentioning

confidence: 99%

Thermal behavior and indirect life test of large-area OLED lighting panels

et al. 2014

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“…We have designed the layers of the display and thermal-management system to assure sufficient lateral heat transfer to prevent this from causing image sticking attributed to premature aging of both OLED and TFT components. 10 Although not discussed, the encapsulation design, thermal-management design, and mechanical design have all been engineered in parallel to enable a strong and robust one-glass TV that will withstand the impacts and vibrations of regular use.…”

Section: Thermal Management and Mechanical Design For Long Oled And Tmentioning

confidence: 99%

System design for a wide‐color‐gamut TV‐sized AMOLED display

et al. 2008

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Abstract— By using current technology, it is possible to design and fabricate performance‐competitive TV‐sized AMOLED displays. In this paper, the system design considerations are described that lead to the selection of the device architecture (including a stacked white OLED‐emitting unit), the backplane technology [an amorphous Si (a‐Si) backplane with compensation for TFT degradation], and module design (for long life and low cost). The resulting AMOLED displays will meet performance and lifetime requirements, and will be manufacturing cost‐competitive for TV applications. A high‐performance 14‐in. AMOLED display was fabricated by using an in‐line OLED deposition machine to demonstrate some of these approaches. The chosen OLED technologies are scalable to larger glass substrate sizes compatible with existing a‐Si backplane fabs.

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“…In addition to the steady-state heat transfer problem, it is necessary to consider the dynamic and local variations in luminance that will result in hot spots. We have designed the layers of the display to assure sufficient lateral heat transfer to prevent this from causing image sticking attributed to premature aging of both OLED and TFT components [8].…”

Section: Thermal Management and Mechanical Design For Long Oled And Tmentioning

confidence: 99%

52.1: System Design for a High Color‐Gamut TV‐Sized AMOLED Display

Hamer

Arnold

Itoh

et al. 2007

Symp Digest of Tech Papers

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Using current technology, it is possible to design and fabricate performance-competitive TV-sized AMOLED displays. In this paper the system design considerations are described that lead to the selection of the device architecture (including a stacked white OLED-emitting unit), the backplane technology (an amorphous Si backplane with compensation for TFT degradation), and module design (for long life and low cost). The resulting AMOLED displays will meet performance and lifetime requirements, and will be manufacturing costcompetitive for TV applications. We fabricated a highperformance 14" AMOLED display using an in-line OLED deposition machine to demonstrate some of these approaches. The chosen OLED technologies are scalable to larger glass substrate sizes compatible with existing a-Si backplane fabs.

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Heat distribution in AMOLEDs

Cited by 9 publications

References 2 publications

Thermal behavior and indirect life test of large-area OLED lighting panels

Thermal behavior and indirect life test of large-area OLED lighting panels

System design for a wide‐color‐gamut TV‐sized AMOLED display

52.1: System Design for a High Color‐Gamut TV‐Sized AMOLED Display

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