SIGNAL-LINE DRIVING CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a signal-line driving circuit having a small circuit scale and capable of suppressing uneven luminance even when applied to a color liquid crystal display device.

SOLUTION: A signal-line driving circuit includes: a first DA converter 41 for generating a positive gradation voltage corresponding to a first signal line 61 or a fourth signal line 64; a second DA converter 42 for generating a negative gradation voltage corresponding to the fourth signal line 64 or the first signal line 61; a third DA converter 43 for generating a positive gradation voltage corresponding to a fifth signal line 65 or a second signal line 62; a fourth DA converter 44 for generating a negative gradation voltage corresponding to the second signal line 62 or the fifth signal line 65; a fifth DA converter 45 for generating a positive gradation voltage corresponding to a third signal line 63 or a sixth signal line 66; a sixth DA converter 46 for generating a negative gradation voltage corresponding to the sixth signal line 66 or the third signal line 63; and first through third input switching-circuits 31 through 33 and first through third output switching-circuits 51 through 53, all for controlling the switching of the above.

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