Novel Devices ♦ news digest
conventional LCD screens, there would be no need to constantly refresh all pixels, you would only have to refresh those pixels that actually change. This means that any display based on this technology would have extremely low energy consumption.”
The research suggests that flexible paper-thin displays based on the technology could have the capacity to switch between a power-saving ‘colour e-reader mode’, and a backlit display capable of showing video. Such displays could be created using cheap materials and, because they would be solid-state, promise to be reliable and easy to manufacture.
David Wright of the Department of Engineering at the University of Exeter, co-author of the paper, said: “Along with many other researchers around the world we have been looking into the use of these GST materials for memory applications for many years, but no one before thought of combining their electrical and optical functionality to provide entirely new kinds of non-volatile, high- resolution, electronic colour displays - so our work is a real breakthrough.”
A report of the research, entitled ‹An optoelectronic framework enabled by low-dimensional phase change films› by Hosseini et al is published in Nature 511, 206-211 (10 July 2014) doi:10.1038/ nature13487
forecasts that less than 1 percent of LCD TV screens will use quantum dots in 2015, growing to 9 percent in 2020.
“Quantum dot solution prices remain high compared to other more entrenched technologies,” said Yoonsung Chung, general manager, NPD DisplaySearch Korea. In 5in smartphone panels, the cost of panels using sheet-type on-surface quantum dots is 20 percent higher than typical TFT LCD smartphone panels. As the display size increases, so does the cost, with the premium for a 55 in TV panel estimated to be 35 percent.
Quantum dot provides a colour gamut exceeding the National Television System Committee (NTSC) colour specifications; typical TFT LCDs achieve only up to 75 percent of NTSC. However quantum dot technology has several problems, including reduced durability, higher cost, and restrictions on the use of cadmium and other heavy metals in household products.
Quantum Dot Display Technology set to enter mainstream markets
New report forecasts rising use of quantum dot displays for smartphones and tablet PCs
According to NPD DisplaySearch’s latest market research on quantum dot displays, by 2015 3 percent of smartphone TFT LCDs will use quantum dots, growing to 26 percent in 2020. In tablet PCs, the figure will be nearly 2 percent in 2015, growing to 15 percent in 2020. For LCD TV, the company
Issue VI 2014
www.compoundsemiconductor.net 159
“Display makers have shown interest in adopting quantum dot technology, but they have been concerned about heavy metals and higher prices,” Chung noted. “Recently, however, the European Union has offered a temporary exemption for the use of cadmium-containing quantum dots in displays. Cadmium-free quantum dot materials have also become available, so display manufacturers are taking a fresh look.”
NPD DisplaySearch’ s Quantum Dot Technology and Market Forecast Report provides global market research on the benefits, challenges, makers and market drivers that affect the adoption of quantum dot technology.
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89 |
Page 90 |
Page 91 |
Page 92 |
Page 93 |
Page 94 |
Page 95 |
Page 96 |
Page 97 |
Page 98 |
Page 99 |
Page 100 |
Page 101 |
Page 102 |
Page 103 |
Page 104 |
Page 105 |
Page 106 |
Page 107 |
Page 108 |
Page 109 |
Page 110 |
Page 111 |
Page 112 |
Page 113 |
Page 114 |
Page 115 |
Page 116 |
Page 117 |
Page 118 |
Page 119 |
Page 120 |
Page 121 |
Page 122 |
Page 123 |
Page 124 |
Page 125 |
Page 126 |
Page 127 |
Page 128 |
Page 129 |
Page 130 |
Page 131 |
Page 132 |
Page 133 |
Page 134 |
Page 135 |
Page 136 |
Page 137 |
Page 138 |
Page 139 |
Page 140 |
Page 141 |
Page 142 |
Page 143 |
Page 144 |
Page 145 |
Page 146 |
Page 147 |
Page 148 |
Page 149 |
Page 150 |
Page 151 |
Page 152 |
Page 153 |
Page 154 |
Page 155 |
Page 156 |
Page 157 |
Page 158 |
Page 159 |
Page 160