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Display

A technology of display devices and light-emitting layers, applied in lighting devices, static indicators, instruments, etc., can solve problems such as intermittent animation display, and achieve the effects of eliminating uneven brightness, reducing electrical power loss, and reducing power loss.

Active Publication Date: 2008-07-23
JVC KENWOOD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, there may be intermittent animation display due to the non-luminous period

Method used

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no. 1 approach 》

[0082] FIG. 1 shows a layer configuration of a pixel of a display device in a first embodiment of the present invention. The display device is, for example, an organic EL display. The glass substrate 1 is a display surface of a display device. The glass substrate 1 may be a plastic substrate as long as an organic film layer can be formed. An anode 2 is formed on the glass substrate 1 . As this anode 2, for example, ITO which is a transparent electrode, etc. can be used.

[0083] An organic film light emitting layer 3 is formed on the anode 2 . The organic film light emitting layer 3 is composed of a combination of a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, and a light emitting layer composed of an organic compound as a phosphor. This combination must be properly selected according to the characteristics of organic EL.

[0084] A cathode 4 is formed on the organic film light emitting layer 3 . As the cathode 4...

no. 2 approach 》

[0122] Next, the pixels in the display device according to the second embodiment of the present invention will be described in detail. In the above-mentioned first embodiment, each organic film light-emitting layer is formed of different materials that emit light with a predetermined luminance image, and the luminance is weighted. In the second embodiment, each organic film light-emitting layer is formed of the same material, and the value of current supplied to each organic film light-emitting layer and the time of supplying current are different to realize light emission with a predetermined brightness. Hereinafter, the specific configuration of the second embodiment and the luminance weighting methods of the first to seventh examples, which are suitable examples of the second embodiment, will be described in detail.

[0123] The layer configuration and pixel structure of the pixel are the same as those of the pixel of the first embodiment shown in FIGS. 1 and 2 , and thus d...

no. 1 example

[0132] First, an example in which different current values ​​are flown to the organic EL light-emitting layers 18 , 19 , and 20 and weighted is shown. The turn-on time of TFTs 24-26 is T1=T2=T3=t.

[0133] Here, the current value of the current I1 flowing to the organic EL light emitting layer 18 is set to i, the current value of the current I2 flowing to the organic EL light emitting layer 19 is set to 2i, and the current value of the current I3 flowing to the organic EL light emitting layer 20 is set to 4i. . The current value thus set is supplied from the current control unit 900 and the power supply unit 381 ′ in the power supply circuit 38 .

[0134] In addition, the value of the current flowing to the organic EL light-emitting layers 18 to 20 is multiplied by the time length to become the luminance weight of each layer.

[0135] (weighted second embodiment)

[0136] Next, an example in which currents of the same current value flow to the organic EL light-emitting laye...

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Abstract

This invention provides a long life display apparatus reducing power loss, in which high definition grayscale display is performed by substantially reducing luminance variations for each pixel in a display face of the display apparatus. A display has light emitting elements, a first driver, a power source, and a second driver. Each light emitting element includes three emission layers 3, 6 and 9 formed one over another to form a color dot in each pixel. The first drivers 16a to 16c drives the emission layers to emit light or no light. The power source passes a current through the first driver to the light emitting element. The second driver individually weights the n emission layers and makes the emission layers emit light so that each dot may express a gradation level.

Description

technical field [0001] The present invention relates to a display device, and more particularly to a display device in which light-emitting layers such as an electroluminescent display are stacked in multiple layers to express gray scales of images. Background technique [0002] An organic electroluminescence display (OLED: organic electroluminescence display) is attracting attention as an ultra-thin, high-contrast, high-speed response, and wide viewing angle display (hereinafter, electroluminescence is also referred to as EL). Organic EL displays utilize the phenomenon of electroluminescence in which organic compounds convert electricity into light. In addition, the use of the active-matrix driving method enables the use of an organic EL display with better energy efficiency, thereby reducing energy loss. Due to these advantages and reasons, organic EL displays are expected to be next-generation displays. [0003] In order to make an organic EL display emit light, the lay...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30G09G3/20H05B33/08H05B44/00
Inventor 大岛芳则增地重博广畑直人
Owner JVC KENWOOD CORP
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