Sanyo Electric Co., Ltd.

Sanyo Telecommunications Co., Ltd.

Shigeo Kinoshita

Yukio Mori

Masutaka Inoue

Atsuhiro Yamashita

Haruhiko Murata

Susumu Tanase

Takashi Yabukawa

Hiroyuki Goya

Yuichi Taneya

Kazuo Nakamoto

Masae Ichino

Atsushi Kinoshita

A technology for reducing the so-called 'phosphor burn-in' phenomenon where the variation of luminance arises by reducing display luminance of a certain pixel caused by deterioration in a display apparatus constituted by an organic electro luminescence element is provided. In the display apparatus, when displaying an image acquired by an image acquiring unit, luminance substantially same as average luminance of the acquired image is set to a non-display area where the image is not displayed.

Organic electro luminescense display apparatus and application thereof

An uneven display correction method including a first step of dividing a display area of a display panel into a plurality of unit areas, the first step setting one arbitrary unit area among the unit areas at a reference area, the first step previously determining a value as a correction parameter in each unit area, the value corresponding to a difference between a light-emission start gradation level of the unit area and the light-emission start gradation level of the reference area; and a second step of correcting an input video signal based on the correction parameter determined in each unit area.

Method of correcting uneven display

When an input detection unit has detected that no user operation has been performed to an organic EL display apparatus for a predetermined period of time or when a processing detection unit has detected that a predetermined processing is being performed, the input detection unit or the processing detection unit outputs an instruction to a reference voltage adjusting unit to modify a reference voltage referenced by a DAC unit upon conversion to an analog output signal.

Display apparatus, mobile terminal and luminance control method in the mobile terminal

The invention provides an organic LED display device of the digital drive type which has a display panel comprising a plurality of pixels. Each of the pixelscomprises an organic EL element, a drive transistor TRfor effecting or interrupting the passage of current through the EL elementin response to the input of an on/off control signal, a write transistor TRto be brought into conduction upon receiving scanning voltage applied thereto from a scanning driver, a capacitance element C to be supplied with data voltage from a data driver by the write transistor TRconducting, and a comparatorfor comparing a predetermined ramp voltage with the output voltage of the capacitance element C and supplying the result of comparison to the drive transistor TRas the on/off control signal.

Display device of digital drive type

A luminance control method for an organic EL display comprises a first step of calculating a luminance accumulation value for each screen on the basis of a video input signal, and a second step of controlling the amplitude of the video input signal on the basis of the luminance accumulation value calculated in the first step and feeding to the organic EL display the video signal whose amplitude has been controlled.

Organic EL display luminance control method and luminance control circuit

In a display apparatus, a luminance acquiring unit acquires luminance signals from inputted image signals. A difference calculating unit compares luminance signals of the current frame acquired by the luminance acquiring unit with those of a previous frame stored in a frame memory, and then takes a difference between these luminance signals. If the difference of the luminance is large, a judging unit judges that the image corresponding to a portion in question is moving. If the difference of the luminance is small, the judging unit judges that the image corresponding to the portion stays still. A gain calculating unit gradually lowers the luminance corresponding to a part where the image stays still, and gradually restores to the original level the luminance corresponding to a part where the image is moving.

Display method and display apparatus

The invention provides a flat display device which comprises for pixels arranged along drive lines a voltage drop calculatorfor calculating a voltage drop occurring in accordance with the position of each pixel, and a video signal converterand a lookup tablefor correcting the input signal to be supplied to the pixel in accordance with the magnitude of the calculated voltage drop, whereby crosstalk due to the voltage drop is prevented.

Growing community of inventors

Higashiosaka, Japan

Shigeo Kinoshita