| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which waiting time is required until LCD driving terminals output signal levels, that are to be measured, in a conventional output signal level testing method of the terminals. SOLUTION: An LCD driving control circuit testing/evaluating circuit is provided with a register 11 in which writing is conducted by a program, a decoder 12 which decodes setting values of the register 11 and multiplexers 7 to 10 which conduct switching of the control signals outputted by the decoder 12 during a testing and the control signals outputted during a normal operation. During a testing, output transistors 2 to 5 are controlled by the control signals outputted by the decoder 12 and output voltage levels of the transistors 2 to 5 are outputted to an LCD from LCD driving terminals 6 so as to conduct testing and evaluation of the output voltage levels of the terminals 6.
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