| Summary: | 碩士 === 國立交通大學 === 電機學院IC設計產業專班 === 95 === Owing to increasing requirements of hand held 3C products, low power consumption, small volume, and light weight; OLED is drifting towards displacement of TN/STN LCD. Active matrix OLED driving circuits surpass passive matrix OLED ones not only in power consumption but also in efficiency. Thus, optimum designs of AMOLED driving circuits for achieving low power consumption, small volume, high uniformity, and long life time, are important topics for today’s display market.
Generally speaking, several advanced driving circuits add one or more control lines to enhance the performance of OLED like extending life time, uniformity, and flexibility compared to conventional OLED driving circuits. However, the additional control lines for driving OLED increase manufacture difficulties and cost. The challenge of diving circuits is to suppress these disadvantages and enhance the performance of OLED display. This thesis proposed a novel pulse width modulation (PWM) scheme for driving AMOLED. As we know, PWM techniques are most popular driving circuits of nowadays due to digital driving methods. Pulse width driving method with high response time of OLED solves motion blur effects, which are disadvantages of today’s TFT LCD. Therefore, this novel PWM driving technique not only decreased half of control lines but also half control pins of driver IC compare to conventional PWM methods. Furthermore, it can increase the life time of OLED material and accurately enhance control gray levels.
Experiment results prove the feasibility of this novel PWM driving technique. We taped out the test key by CPT for demonstrating the function and performance. In the future, we can use the concept proposed by our PWM driving technique to design a large size OLED panel to achieve a high uniformity, low cost, and long life-time OLED display.
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