A liquid crystal display device, comprising: a plurality of scan lines (G21, G22, G23); a plurality of data line sets (D20-1, D20-2) intersecting the plurality of scan lines, wherein each data line set comprises a first data line (D21, D24), a second data line (D22, D25) and a third data line (D23, D26); pixel units formed in areas encircled by the intersecting scan and data lines; a data line test area comprising a data line shorting bar, a first data switch control line and a second data switch control line and a plurality of switch elements (204-1, 204-2, 205-1, 205-2); wherein, in each data line set (D20-1, D20-2), the first data line (D21, D24) controls pixel units with a same first color, the second data line (D22, D25) controls pixel units with a same second color, and the third data line (D23, D26) controls pixel units with a same third color, wherein the first color, the second color and the third color are different to each other; wherein, for each data line set (D20-1, D20-2), the first data line is connected with the data line shorting bar, the first data switch control line overlaps with the second data line (D22, D25) at a first overlapping point, and the first switch element (204-1, 205-1) is formed at said first overlapping point, a gate electrode of the first switch element (204-1, 205-1) is provided by the first data switch control line, a source electrode of the first switch element (204-1, 205-1) is connected with the data line shorting bar, and a drain electrode of the first switch element (204-1, 205-1) is connected with the second data line (D22, D25); and wherein, for each data line set (D20-1, D20-2), the second data switch control line overlaps with the third data line (D23, D26) at a second overlapping point and the second switch element (204-2, 205-2) is formed at said second overlapping point, a gate electrode of the second switch element (204-2, 205-2) is provided by the second data switch control line, a source electrode of the second switch element (204-2, 205-2) is configured such that it is connectable with the data line shorting bar through the first switch element (204-1, 205-1), and a drain electrode of the second switch element (204-2, 205-2) is connected with the third data line (D23, D26). a plurality of scan lines (G21, G22, G23); a plurality of data line sets (D20-1, D20-2) intersecting the plurality of scan lines, wherein each data line set comprises a first data line (D21, D24), a second data line (D22, D25) and a third data line (D23, D26); pixel units formed in areas encircled by the intersecting scan and data lines; a data line test area comprising a data line shorting bar, a first data switch control line and a second data switch control line and a plurality of switch elements (204-1, 204-2, 205-1, 205-2); wherein, in each data line set (D20-1, D20-2), the first data line (D21, D24) controls pixel units with a same first color, the second data line (D22, D25) controls pixel units with a same second color, and the third data line (D23, D26) controls pixel units with a same third color, wherein the first color, the second color and the third color are different to each other; wherein, for each data line set (D20-1, D20-2), the first data line is connected with the data line shorting bar, the first data switch control line overlaps with the second data line (D22, D25) at a first overlapping point, and the first switch element (204-1, 205-1) is formed at said first overlapping point, a gate electrode of the first switch element (204-1, 205-1) is provided by the first data switch control line, a source electrode of the first switch element (204-1, 205-1) is connected with the data line shorting bar, and a drain electrode of the first switch element (204-1, 205-1) is connected with the second data line (D22, D25); and wherein, for each data line set (D20-1, D20-2), the second data switch control line overlaps with the third data line (D23, D26) at a second overlapping point and the second switch element (204-2, 205-2) is formed at said second overlapping point, a gate electrode of the second switch element (204-2, 205-2) is provided by the second data switch control line, a source electrode of the second switch element (204-2, 205-2) is configured such that it is connectable with the data line shorting bar through the first switch element (204-1, 205-1), and a drain electrode of the second switch element (204-2, 205-2) is connected with the third data line (D23, D26).