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Display device

A display device and display panel technology, which is applied to lighting devices, static indicators, cathode ray tube indicators, etc., can solve problems such as changes in action points, reduction in luminous brightness, and changes in luminous brightness.

Active Publication Date: 2005-04-06
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] However, if Figure 17 As shown, in the above-mentioned organic EL display device, the organic EL characteristics are shifted due to the temperature change and aging of the organic EL element, and as a result, the operating point changes, resulting in the problem that the luminance changes.
That is, when the organic EL characteristics are shifted to the right due to temperature changes or aging of the organic EL element, as shown in the figure, the current flowing through the organic EL element decreases, and the luminance of light emission becomes lower.

Method used

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Examples

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no. 1 example

[0097] figure 1 The organic EL display device of this example is shown.

[0098] An image signal supplied from an image source such as a TV receiver is converted into digital data by an A / D converter not shown in the figure, and then supplied to the comparison / calculation unit 1, where signal processing necessary for image display and correction processing described later are performed. . The thus-obtained image data of the three primary colors of RGB is output to the driver IC 2 , and a data voltage corresponding to the data is supplied to each pixel of the organic EL display 3 . In each pixel, a driving current corresponding to the data voltage is supplied to the organic EL element, and the organic EL element emits light.

[0099] Such as image 3 As shown by the dotted line, the organic EL display device of this embodiment divides the display area of ​​the organic EL display 3 into a plurality of areas, and can correct the image data in each area and each color of the t...

no. 2 example

[0125] The organic EL device of the first embodiment corrects the image data according to temperature change or aging, but the organic EL display device of the present embodiment changes the relationship between the image data and the data voltage.

[0126] Figure 9 In the organic EL display device of this embodiment, an image signal supplied from an image source such as a TV receiver is converted into digital data by an A / D converter not shown in the figure, and then supplied to the comparison / calculation unit 10, which is necessary for performing image display. signal processing. The thus obtained 8-bit image data of three colors of RGB is output to the driver IC 20 . As will be described later, the drive IC 20 changes the relationship between the image data and the data voltage based on the control signal obtained from the comparison / calculation unit 10, and supplies the data voltage corresponding to the image data to each pixel of the organic EL display 3 according to th...

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Abstract

The present invention provides a display device comprising a display having an arrangement of a plurality of pixels, a drive IC for supplying to each pixel of the display data voltage or data current corresponding to a video signal fed from the outside, comparing / calculating unit for supplying the video signal to the drive IC, and a current monitor unit for measuring the total quantity of currents to have been passed through a plurality of pixels of the display. The comparing / calculating unit derives the sum of currents to be passed through each pixel of the display based on the values of the video signals for each pixel of the display, to correct the video signals for each pixel of the display based on the derived value and measurement value obtained by the current monitor unit.

Description

technical field [0001] The present invention relates to a display device, such as an organic electroluminescent display device, including a display panel configured by arranging a plurality of pixels. Background technique [0002] In recent years, development of organic electroluminescent displays (hereinafter referred to as organic EL displays) has been progressing, and for example, the use of organic EL displays in mobile phones is being studied. [0003] As driving methods of organic EL displays, there are known: a passive matrix driving type in which scanning electrodes and data electrodes are used for time-division driving; and an active matrix driving type in which light emission of each pixel is maintained throughout the vertical scanning line period. [0004] In addition, as a driving method of an active matrix drive type EL display device, there is an analog drive type display in which a current of a magnitude corresponding to a data voltage is supplied to an organi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B33/12G09G3/20G09G3/30G09G3/32G09G3/34G09G5/00H01L51/50H05B33/14H05B44/00
CPCG09G2320/043G09G3/3225G09G2320/029G09G2310/027H05B33/0866G09G3/3275G09G2330/02G09G2320/0285G09G2320/048H05B45/24G09G2310/0259
Inventor 井上益孝山下敦弘
Owner SANYO ELECTRIC CO LTD
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