| 摘要 |
A data line driver circuit for a display panel includes a digital-to-analog (D/A) converter circuit. The D/A converter circuit includes a first gradation voltage selecting circuit configured to control transistors of a first group to select one of gradation voltages of a first polarity based on a first display data; a second gradation voltage selecting circuit configured to control transistors of a second group to select one of gradation voltages of a second polarity based on a second display data; a first gradation voltage signal line configured to transfer the first polarity gradation voltage selected by the first gradation voltage selecting circuit; a second gradation voltage signal line configured to transfer the second polarity gradation voltage selected by the second gradation voltage selecting circuit; and a test switching circuit configured to operate in response to a test signal. The test switching circuit forms a short-circuit between the first and second gradation voltage signal lines in response to the test signal, to allow a leakage current to be measured between a drain and a source in each of one or more of the transistors of the first group and one or more of the transistors of the second group.
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