In a liquid crystal display device it is desirable to test in the state of TFT substrates, without reducing the number of TFT substrates to be obtained from one mother TFT substrate, and without increasing the overall size of the TFT substrates. Test terminals are formed on the outside of terminals for driving the liquid crystal display device. The test terminals of the specific TFT substrate are formed in another TFT substrate just below the specific TFT substrate. The area in which the test lines are formed is a space in which a sealing material is formed, between the display area and an end of the lower TFT substrate. Thus, the size of the TFT substrates is not actually increased. A test line area is not separately formed and not discarded, so that the number of TFT substrates to be obtained from one mother TFT substrate is not reduced.
1. A liquid crystal display device comprising:
a TFT substrate including a display area in which pixels each having a pixel electrode and a TFT are arranged in a matrix form, as well as a terminal portion;
a counter substrate disposed opposite to the TFT substrate; and
a sealing material formed in the periphery to bond the TFT substrate and the counter substrate together;
wherein the display area includes scan lines extending in a first direction and arranged in a second direction, image signal lines extending in the second direction and arranged in the first direction, and a common line;
wherein a driving terminal and a test terminal are formed in the terminal portion;
wherein a plurality of lines are formed on the side opposite to the side on which the terminal portion is formed;
wherein the plurality of lines are not connected to the scan lines, the image signal lines, and the common line, and are arranged parallel to the side opposite to the side on which the terminal portion is formed;
wherein the plurality of lines are used for testing a TFT substrate of another liquid crystal display device.
2. A liquid crystal display device comprising:
a TFT substrate including a display area in which pixels each having a pixel electrode and a TFT are arranged in a matrix form, as well as a terminal portion;
a counter substrate disposed opposite to the TFT substrate; and
a sealing material formed in the periphery to bond the TFT substrate and the counter substrate together,
wherein the display area includes scan lines extending in a first direction and arranged in a second direction, and image signal lines extending in the second direction and arranged in the first direction,
wherein a driving terminal and a test terminal are formed in the terminal portion,
wherein a plurality of first lines are formed between the side on which the terminal portion is formed, and the test terminal,
wherein the plurality of first lines are connected to the test terminal, and are arranged parallel to the side on which the terminal portion is formed,
wherein a plurality of second lines are formed on the side opposite to the side on which the terminal portion is formed,
wherein the plurality of second lines are not connected to the scan lines or the image signal lines, and are arranged parallel to the side opposite to the side on which the terminal portion is formed, and
wherein leaders extend from the plurality of second lines to the side opposite to the side on which the terminal portion is formed.
3. The liquid crystal display device according to claim 2 ,
wherein the plurality of first and second lines are used for the test of the TFT substrate.