Oki Electric Industry Co., Ltd.

Oki Semiconductor Co., Ltd.

Seiichirou Ishimoto

Naoya Kimura

Kunio Takamatsu

A display device includes a controller detecting a black line, in which all light emitting diodes in one line are non-luminescence, counting a number of times (S) that display data indicating the black line is sent to the display panel in serial, halting a scanning operation to the display data indicating the black line, applying the time period for halting the scanning operation to another time period for displaying display data, which are next to the display data indicating the black line and which is not the display data indicating the black line, whereby the another time period for displaying display data is set to 'S+1' times longer than a stipulated time period, and sending a control signal to a column driver, which controls the column driver to set a drive current or voltage applied from a power source to a 1/(S+1) of the stipulated value for the 'S+1' time period.

Display device and method of displaying image

A semiconductor storage device has a simple control circuit that is added to a general one-port RAM. Taking a port-A clock signal as the reference, the control circuit generates a select signal that selects a port A during the period from elapse of a first predetermined time from the reference timing until a second predetermined time has elapsed and selects a port B during other periods. The control circuit generates a port-A delayed clock signal in the period in which the port A is selected. The control circuit generates a port-B delayed clock signal during the period from elapse of the second predetermined time until a third predetermined time has elapsed. The control circuit generates a conflict monitoring signal during the period from the reference timing until the second predetermined time has elapsed. When a clock signal is supplied from the port B while the conflict monitoring signal is being generated, the port-B delayed clock signal is masked while the conflict monitoring signal is being generated. After the conflict monitoring signal is stopped, the B-port delayed clock signal is generated as a port-B clock signal.

Growing community of inventors

Fukuoka, Japan

Seiichirou Ishimoto