| Nombor Bahagian | LJ640U21 |
| Jenama | SHARP |
| Saiz | 7.9 |
| Permohonan | IA |
| Resolusi | 640×200 |
| Komposisi | EL |
| Kecerahan | 60 |
| CR | |
| Warna | Monochrome |
| Lampu latar | self |
| Antara muka | |
| jenama panel | SHARP |
| model panel | LJ640U21 |
| jenis panel | EL , EL |
| saiz panel | 7.9 inch |
| resolusi | 640×200 |
| kawasan aktif | 191.9×59.9 mm |
| garis besar | 238×108×27 mm |
| permukaan | |
| kecerahan | 60 cd/m² (Typ.) |
| nisbah kontras | |
| warna paparan | Monochrome |
| sudut pandangan | |
| kekerapan | 60Hz |
| voltan masukan | 5.0/15.0V (Typ.)(VL/VD) |
| permohonan | IA |
| B080XAN01.0 | AUO | 7.9 | 768×1024 |
| B080XAN02.0 | AUO | 7.9 | 768×1024 |
| LJ640U21 | SHARP | 7.9 | 640×200 |
| LJ640U34 | SHARP | 8.9 | 640×400 |
| LJ640U35 | SHARP | 8.9 | 640×400 |
| LJ640U48 | SHARP | 9.4 | 640×480 |
| LJ64H034 | SHARP | 8.9 | 640×400 |
| LP079QX1-SP0V | LG Display | 7.9 | 1536×2048 |
| LQ079L1SX01 | SHARP | 7.9 | 1536×2048 |
| G104SN02 V1 | AUO | 10.4 | 800×600 |
| G156BGE-L01 | Innolux | 15.6 | 1366×768 |
| LQ057V3DG02 | SHARP | 5.7 | 640×480 |
| LQ084S3LG01 | SHARP | 8.4 | 800×600 |
| LQ10D367 | SHARP | 10.4 | 640×480 |
| LQ121S1DG42 | SHARP | 12.1 | 800×600 |
| LTB190E1-L01 | Samsung | 19.0 | 1280×1024 |
| LTM09C015A | TOSHIBA | 9.4 | 640×480 |
| PD050OX1 | E Ink | 5.0 | 480×480 |
| TX38D01VM1AAA | KOE | 15.0 | 1024×768 |