本文選題：OLED + 溫度補償結(jié)構(gòu)��； 參考：《電子科技大學》2014年碩士論文

【摘要】：近幾年AMOLED顯示屏幕因其表現(xiàn)出比LCD顯示器具有更廣的視角、更好的畫質(zhì)、更快的響應速度,但是又不需要背光板,而且功耗更低等優(yōu)點而被廣泛應用于移動終端,尤其AMOLED的柔性特點可以使其有更加廣泛的應用領域。據(jù)displayresearch近年來的調(diào)研報告顯示,OLED的滲透率逐年攀升,大有取代LCD成為新一代主流顯示屏的趨勢。OLED器件隨溫度的降低會出現(xiàn)發(fā)光亮度衰減和啟亮延遲等問題,因此為了保持優(yōu)質(zhì)的顯示效果,設計一個能夠補償OLED這種溫度特性的系統(tǒng)是有意義的。本論文設計了一種用于補償OLED因溫度降低而造成的發(fā)光亮度衰減和啟亮延遲的電路結(jié)構(gòu),該結(jié)構(gòu)主要包括用于檢測顯示面板溫度的傳感器電路和用調(diào)節(jié)電壓方式補償OLED亮度變化的補償電路的一部分,也設計了將傳感器輸出轉(zhuǎn)化為對補償電路控制信號的數(shù)字轉(zhuǎn)換電路。區(qū)別于市面上通過驅(qū)動芯片來檢測溫度并輸出控制信號來調(diào)整AMOLED負電源電壓值的方式,本設計將完全集成于顯示驅(qū)動芯片上,采用調(diào)整片上基準輸出電壓進而完成對GAMMA曲線調(diào)整的方式來進行補償,不用芯片互聯(lián)和增加輸出引腳。在本設計中,因為補償范圍是從-30℃到10℃之間,且每隔10℃補償一次,因此對傳感器精度并不嚴苛,折衷面積和功耗的要求設計了一款頻率輸出的傳感器,傳感器輸出頻率隨溫度成線性增大,相鄰兩攝氏度的頻率差約為117kHz,精度為1℃,功耗約為152μW;信號轉(zhuǎn)換電路由一個9位計數(shù)器和由若干與門、與非門和D觸發(fā)器組成,通過設置相應的計數(shù)閾值(約8.5μs)而得到相應溫度下的頻率計數(shù),進而將計數(shù)轉(zhuǎn)換為控制電平;補償電路結(jié)構(gòu)是對芯片系統(tǒng)中的帶隙基準源進行改進,使基準源的輸出電壓可調(diào),總共6個不同非等差數(shù)列的電壓輸出值,補償不同的溫度條件。基準的溫度系數(shù)為10ppm/℃,PSRR為-75.4dB,誤差±2.3mV以內(nèi)。通過仿真驗證表明設計出來的電路系統(tǒng)可以實現(xiàn)預期的功能。
[Abstract]:In recent years, the AMOLED display screen has been widely used in mobile terminals because of its advantages such as wider viewing angle, better picture quality, faster response speed than LCD display, but no need of backlight board, and lower power consumption. In particular, the flexibility of AMOLED can make it have a wider range of applications. According to the research report of displayresearch in recent years, the penetration rate of displayresearch has been increasing year by year, and it has a tendency to replace LCD as a new generation of mainstream display screen. With the decrease of temperature, OLED devices will have the problems of luminance attenuation and brightness delay, etc. So it makes sense to design a system that can compensate for the temperature characteristics of OLED in order to maintain good display effect. In this paper, a circuit structure is designed to compensate for the luminance attenuation and delay caused by the temperature decrease of OLED. The structure consists mainly of a sensor circuit for detecting the panel temperature and a part of a compensation circuit for compensating the brightness change of OLED by regulating the voltage. A digital conversion circuit is also designed to convert the sensor output to the control signal of the compensation circuit. Different from the way in the market where AMOLED negative power supply voltage can be adjusted by driving chip to detect temperature and output control signal, this design will be fully integrated into display driver chip. The method of adjusting the output voltage of on-chip datum to adjust the gamma curve is adopted to compensate without the chip interconnection and the increase of output pin. In this design, because the compensation range is from -30 鈩，

本文編號：2057552