Patent ID: 11967295
Assignee: LAPIS TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 8:
9. A display device comprising:
a display panel comprising first to n-th source lines, where n is an integer of 2 or more; and
a display driver which generates first to n-th drive voltages based on an image signal and supplies the first to n-th drive voltages to the first to n-th source lines of the display panel,
wherein the display driver comprises:
a conversion part which converts first to n-th display data pieces representing a brightness level of each pixel based on the image signal into first to n-th gradation voltages each having a voltage value corresponding to the brightness level, and outputs the first to n-th gradation voltages;
an output amplifier part which generates n voltages obtained by amplifying each of the first to n-th gradation voltages as the first to n-th drive voltages;
a polarity inversion signal generation circuit which generates a polarity inversion signal for prompting polarity inversion for a frame display period according to the image signal;
a first external terminal which receives an operation mode signal representing a test mode or a normal mode; and
a first selector which receives the operation mode signal from the first external terminal, a test polarity inversion signal for prompting polarity inversion and the polarity inversion signal, wherein the first selector selects and outputs the polarity inversion signal when the operation mode signal represents the normal mode, and the first selector selects and outputs the test polarity inversion signal when the operation mode signal represents the test mode,
wherein the test polarity inversion signal is independent from the polarity inversion signal,
wherein the conversion part inverts a polarity of the voltage value of each of the output first to n-th gradation voltages according to a signal output by the first selector from among the test polarity inversion signal and the polarity inversion signal.