One of the major challenges when fabricating high gamut colour-converted micro-light-emitting diodes(LEDs)displays is severe crosstalk effect among adjacent pixels because of the wide view-angle feature of micro-LED c...One of the major challenges when fabricating high gamut colour-converted micro-light-emitting diodes(LEDs)displays is severe crosstalk effect among adjacent pixels because of the wide view-angle feature of micro-LED chips.In this study,potential factors that contribute to the crosstalk effect were systematically simulated.We observed that precisely filling the space between each micro-LED chip with a light blocking matrix(LBM)can be a promising solution to alleviate this risk.After careful investigations,a press-assisted moulding technique was demonstrated to be an effective approach of fabricating the LBM.Nevertheless,experimental observations further revealed that residual black LBM on the surface of micro-LEDs severely reduces the brightness,thereby compromising the display performance.This problem was successfully addressed by employing a plasma etching technique to efficiently extract the trapped light.Eventually,a top-emitting blue micro-LED-based backlight fine-moulded with a black LBM was developed and combined with red and green quantum dot colour-conversion layers for full-colour display.The colour gamut of our manufactured display prototype can cover as high as 122%that of the National Television Standards Committee.展开更多
After a theoretical model is put forward on the base of accurate description of the Raman gain profile and the physical quantity, maximum Raman crosstalk(MRC), which quantificationally depicts the intensity of Raman c...After a theoretical model is put forward on the base of accurate description of the Raman gain profile and the physical quantity, maximum Raman crosstalk(MRC), which quantificationally depicts the intensity of Raman crosstalk is defined. The influences of launch power, fiber effective core area, fiber nonlinear index, fiber length, channel number and channel interval on MRC are deduced. The result indicates that compared with low speed and narrowband optical fiber communication system, serious Raman crosstalk lies in high speed and broadband system, which impacts the performance of the system badly. The result is useful for forecasting Raman crosstalk in broadband and high speed optical fiber communication system.展开更多
为了提升光纤的传输性能,设计了一种空气孔-沟槽辅助六芯光纤结构。六芯光纤中每根纤芯被一层低折射率沟槽包围,纤芯与沟槽之间存在一层包层,同时光纤周围环绕着空气孔辅助结构。基于光纤的耦合模式理论,对光纤的串扰、模场面积以及弯...为了提升光纤的传输性能,设计了一种空气孔-沟槽辅助六芯光纤结构。六芯光纤中每根纤芯被一层低折射率沟槽包围,纤芯与沟槽之间存在一层包层,同时光纤周围环绕着空气孔辅助结构。基于光纤的耦合模式理论,对光纤的串扰、模场面积以及弯曲损耗3种传输特性进行了深入分析。研究结果表明:带有空气孔-沟槽辅助结构的光纤在芯间串扰方面表现最佳,串扰值达到最低约-55 d B;而单沟槽辅助结构则有效增大了光纤的模场面积,达到最大值约390μm^(2)。然而,不同结构下光纤的弯曲损耗变化并未呈现明显规律,但其对数取值集中在4~9 d B/m。展开更多
Main quadrupole magnets are critical for the Circular Electron and Positron Collider(CEPC)and are specifically designed as dual aperture quadrupole(DAQ)magnets.However,the field crosstalk between the two apertures pre...Main quadrupole magnets are critical for the Circular Electron and Positron Collider(CEPC)and are specifically designed as dual aperture quadrupole(DAQ)magnets.However,the field crosstalk between the two apertures presents challenges.As the CEPC will work at four beam energies of Z,W,Higgs and ttbar mode,the DAQ magnets will operate at four field gradients spanning from 3.18 to 12.63 T/m.The first short quadrupole magnet prototype with the bore diameter of 76 mm and magnetic length of 1.0 m revealed the problems of large magnetic field harmonics and a magnetic center shift within the beam energy range.Accordingly,a compensation method was proposed in this work to solve the field crosstalk effect.By adjusting the gap height at the middle of the two apertures,the field harmonics and magnetic center shift are significantly reduced.After optimization,the short prototype was modified using a new scheme.The field simulations are validated from the magnetic measurement results.Further,the multipole field meets the requirements of the four beam energies.The detailed magnetic field optimization,field harmonics adjustment,and measurement results are presented herein.展开更多
基金This work was financially supported by the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515110085)Key-Area Research and Development Program of Guangdong Province(No.2019B010924003)+2 种基金Shenzhen Hong Kong Innovation Circle Joint R&D Project(SGDX20190918105201704)Shenzhen Fundamental Research Program(No.GXWD20201231165807007-20200810113811001)Shenzhen Science and Technology Research Grant(JCYJ20170818085627903).
文摘One of the major challenges when fabricating high gamut colour-converted micro-light-emitting diodes(LEDs)displays is severe crosstalk effect among adjacent pixels because of the wide view-angle feature of micro-LED chips.In this study,potential factors that contribute to the crosstalk effect were systematically simulated.We observed that precisely filling the space between each micro-LED chip with a light blocking matrix(LBM)can be a promising solution to alleviate this risk.After careful investigations,a press-assisted moulding technique was demonstrated to be an effective approach of fabricating the LBM.Nevertheless,experimental observations further revealed that residual black LBM on the surface of micro-LEDs severely reduces the brightness,thereby compromising the display performance.This problem was successfully addressed by employing a plasma etching technique to efficiently extract the trapped light.Eventually,a top-emitting blue micro-LED-based backlight fine-moulded with a black LBM was developed and combined with red and green quantum dot colour-conversion layers for full-colour display.The colour gamut of our manufactured display prototype can cover as high as 122%that of the National Television Standards Committee.
基金Supported by the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institute of MOE, P.R.C.
文摘After a theoretical model is put forward on the base of accurate description of the Raman gain profile and the physical quantity, maximum Raman crosstalk(MRC), which quantificationally depicts the intensity of Raman crosstalk is defined. The influences of launch power, fiber effective core area, fiber nonlinear index, fiber length, channel number and channel interval on MRC are deduced. The result indicates that compared with low speed and narrowband optical fiber communication system, serious Raman crosstalk lies in high speed and broadband system, which impacts the performance of the system badly. The result is useful for forecasting Raman crosstalk in broadband and high speed optical fiber communication system.
文摘为了提升光纤的传输性能,设计了一种空气孔-沟槽辅助六芯光纤结构。六芯光纤中每根纤芯被一层低折射率沟槽包围,纤芯与沟槽之间存在一层包层,同时光纤周围环绕着空气孔辅助结构。基于光纤的耦合模式理论,对光纤的串扰、模场面积以及弯曲损耗3种传输特性进行了深入分析。研究结果表明:带有空气孔-沟槽辅助结构的光纤在芯间串扰方面表现最佳,串扰值达到最低约-55 d B;而单沟槽辅助结构则有效增大了光纤的模场面积,达到最大值约390μm^(2)。然而,不同结构下光纤的弯曲损耗变化并未呈现明显规律,但其对数取值集中在4~9 d B/m。
文摘Main quadrupole magnets are critical for the Circular Electron and Positron Collider(CEPC)and are specifically designed as dual aperture quadrupole(DAQ)magnets.However,the field crosstalk between the two apertures presents challenges.As the CEPC will work at four beam energies of Z,W,Higgs and ttbar mode,the DAQ magnets will operate at four field gradients spanning from 3.18 to 12.63 T/m.The first short quadrupole magnet prototype with the bore diameter of 76 mm and magnetic length of 1.0 m revealed the problems of large magnetic field harmonics and a magnetic center shift within the beam energy range.Accordingly,a compensation method was proposed in this work to solve the field crosstalk effect.By adjusting the gap height at the middle of the two apertures,the field harmonics and magnetic center shift are significantly reduced.After optimization,the short prototype was modified using a new scheme.The field simulations are validated from the magnetic measurement results.Further,the multipole field meets the requirements of the four beam energies.The detailed magnetic field optimization,field harmonics adjustment,and measurement results are presented herein.
