Driving circuit, method of testing driving circuit, electro-optical apparatus, and electro-optical device
AssigneeSeiko Epson Corporation
InventorShin Fujita
Life of this patent
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Abstract
To provide a highly-reliable testing method of a level shifter, a driving circuit of an electro-optical panel includes a shift register, a level shifter, and a logic operation device. The shift register sequentially outputs first transfer pulses from a plurality of stages. The level shifter shifts the voltage level of each of sequentially-output first transfer pulses thereby outputting a sequence of second transfer pulses as driving signals. The logic operation device performs a logic operation on sequentially-output second transfer pulses thereby outputting test signals the number of which is smaller than the number of stages of the shift register.
Claims15
A driving circuit, comprising:
- a shift register to sequentially output first transfer pulses from a plurality of stages of the shift register;
- a level shifter to shift the levels of the sequentially-output first transfer pulses thereby sequentially outputting second transfer pulses as driving signals;
- and
- a logic operation device to perform a logic operation on the sequentially-output second transfer pulses thereby outputting test signals which change with time in response to changes in the sequentially-output second transfer pulses and the number of which is smaller than the number of stages, N, of the shift register.
A driving circuit, comprising:
- a shift register to sequentially output first transfer pulses from a plurality of stages of the shift register;
- and
- a level shifter to shift the levels of the sequentially-output first transfer pulses thereby sequentially outputting second transfer pulses as driving signals,
- the level shifter including a logic operation device to perform a logic operation on the sequentially-output second transfer pulses thereby outputting test signals which change with time in response to changes in the sequentially-output second transfer pulses, and the number of which is smaller than the number of stages, N, of the shift register.
Dependencies are inferred from the claim text.