US 6,388,389 B2 · Display device

Abstract

The invention provides a method and apparatus to obtain accurate gradation by obtaining an accurate ratio of light emitting parts in a display device which implements gradation by forming a plurality of TFTs and a plurality of OELDs in each pixel, directly connecting the TFTs and OELDs, and switching an on and off state of the TFTs, and controlling a light emitting area of the OELDs. A plurality of OELDs have the same shape, and gradation can be implemented by controlling the number of OELDs that emit light. A plurality of OELDs have a round shape. A plurality of OELDs are arranged at the same interval in a vertical and/or horizontal direction. According to this structure, because the light emitting areas of the plurality of OELDs become equal to each other, by controlling the number of OELDs, a ratio of the light emitting areas can be accurately obtained.

Claims11

Dependent claims

A display device, comprising:

a plurality of organic electro-luminescent elements, at least one of the plurality of organic electro-luminescent elements having light emitting areas that are substantially the same as that of another of the plurality of organic electro-luminescent elements, the plurality of organic electro-luminescent elements being switchable between on and off states, the plurality of organic electro-luminescent elements emitting light when in the on state;
and
a plurality of thin film transistors that switch the plurality of organic electro-luminescent elements between the on and off states, wherein gradation, for displaying, corresponds to a number of the plurality of organic electro-luminescent elements that are in the on state.

Dependencies are inferred from the claim text.

Display device

Life of this patent

Display device

Life of this patent

Abstract

Claims11