Looped zebra blind with height compensation and height compensation method of the same

A looped zebra blind with height compensation and used to cover a window comprising:

• an upper rod that is disposed on or close to an upper edge of the window;
• a lower rod that is arranged at or close to a lower edge of the window and corresponding to the upper rod;
• a looped fabric that is used for covering a preset covered area of the window and having a zebra fabric part and at least one to compensation part connected to each other so as to form a loop wound around the upper rod and the lower rod vertically while the loop having a front fabric and a rear fabric with a same height and corresponding to each other;
• the zebra fabric part including a plurality of zebra fabric units arranged vertically and periodically;
• wherein each zebra fabric unit is formed by a see-through part and an opaque part adjacent to each other and with certain height;
• wherein a net length of the compensation part is calculated and set in advance to make a total length of the looped fabric become equal to a sum of the total length of the zebra fabric part and a net length of the compensation part;
• and the height of the front fabric or the rear fabric is almost equal to a half of the total length of the looped fabric after height compensation;
• thereby the height of the front fabric or the rear fabric matches up to a preset height of the preset covered area of a window;
• the preset covered area is completely shaded by the looped fabric;
• wherein when the front fabric or the rear fabric is pulled upward or downward, overlapping of the see-through parts and the opaque parts of the front fabric and the rear fabric is able to be adjusted by synchronous and relative movement between the front fabric and the to rear fabric after height compensation without changing the height of the front fabric and the rear fabric;
• thus opacity of the looped zebra blind in relative to the window is adjusted, and wherein the net length of the compensation part is given by the following equations:
• Lc=2Hw−[Hu×(N−n)];Lc=Hcf+Hcr;
• and Hu=Hb+Hs;
• wherein Lc is the net length of the compensation part, Hw represents preset height of the preset covered area of the window that is completely covered by the looped fabric, Hu is a height of the zebra fabric unit, N is a whole number in a ratio of 2Hw to Hu (2Hw/Hu), n is a whole number and representing a range of the net length of the compensation part Lc in the looped fabric, N>n≥0, Hcf is a net height of a front compensation part that is a part of the compensation part on the front fabric, Hcr is the net height of a rear compensation part that is a part of the compensation part on the rear fabric, Hb is a height of the opaque part of the zebra fabric unit, and Hs is a height of the see-through part of the zebra fabric unit;
• Lc, Hw and Hu have the same length unit;
• wherein a length of the looped fabric wound around the upper rod and the lower rod after height compensation is considered to be negligible;
• wherein the net length of the compensation part Lc includes the net height of the front compensation part Hcf on the front fabric and the net height of the rear compensation part Hcr on the rear fabric, Lc=Hcf+Hcr.