雙行雙穩(wěn)態(tài)LED顯示單元的設(shè)計(jì)

為彌補(bǔ)傳統(tǒng)掃描驅(qū)動(dòng)方式所引起的主觀視覺亮度下降的缺陷，幾乎所有高端室外LED顯示屏均采用了靜態(tài)鎖存的驅(qū)動(dòng)方法，但這又使驅(qū)動(dòng)電路的規(guī)模大大增加。為了解決此問題，文章從“塔爾博特-普拉竇定律”著手，將光學(xué)雙穩(wěn)態(tài)特性引入LED顯示單元，通過提高一個(gè)掃描周期內(nèi)LED顯示單元的占空比提高LED顯示屏的亮度，研制出了一種雙行雙穩(wěn)態(tài)LED顯示屏。通過實(shí)際測(cè)試，證明該顯示屏在掃描驅(qū)動(dòng)方式下具有等同于靜態(tài)鎖存驅(qū)動(dòng)的LED屏的亮度表現(xiàn)，并大大提高了LED的使用壽命，而且其結(jié)構(gòu)簡(jiǎn)單，外圍電路與傳統(tǒng)器件完全兼容，易于使用和推廣。

Abstract:

?The traditional way of scanning drive mode will cause the subjective brightness sensation decline. To make up this disadvantage， almost all high￣end outdoor LED displays are driven by the static latch method， but this method greatly increased the size of drive circuit. According to “The Talbot’Plateau Law”， this paper brought optical bistable characteristic to LED display unit， which increased the brightness of LED display by improving the duty cycle of the LED display unit in a scanning cycle. A bistable LED display composed by bistable LED modules was developed. The results demonstrate that the bistable LED display’s brightness in scanning drive mode has the same performnce as the static latch’driven LED display， and greatly increases the life of LED. It’s structure is simple， and the external circuit is fully compatible with conventional devices, so it is easy to use and promote.