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Display and its drive method

A driving method and display technology, which are applied to static indicators, instruments, electric solid-state devices, etc., can solve the problems of reduced screen aperture and reduced integration of thin-film transistors, so as to achieve no non-light-emitting time, no reduction in aperture ratio, show uniform effect

Inactive Publication Date: 2003-05-14
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0036] However, in the structure in which the current measuring device is provided for each pixel, when the current measuring device is installed at each pixel position, the problems of lowering the integration degree of the thin film transistor (TFT) of each pixel and reducing the screen aperture will occur.

Method used

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  • Display and its drive method
  • Display and its drive method

Examples

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Embodiment Construction

[0064] Embodiment 1

[0065] One embodiment of the present invention will be described below. In this embodiment, an organic EL display using an organic EL element as a self-luminous element will be described. But not limited to this. For example, the present invention is applicable to a display such as a field emission display (FED) that uses an electro-optical element that adjusts luminance according to an element current value.

[0066] In this embodiment, the organic EL display will be described as an active matrix type organic EL display. This is because, as mentioned above, in the current-driven optical element whose luminous luminance is proportional to the current density flowing through the element, such as the organic EL element, in terms of luminous efficiency and low voltage, the active element is arranged in each image. The relationship that the active matrix type on the element is more advantageous than the passive (simple) matrix type.

[0067] In addition, ...

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Abstract

A display in accordance with the present invention includes: photoelectric elements as pixels; scan signal lines for sequentially driving the photoelectric elements; video data signal lines for supplying video data signals to the photoelectric elements; and drive-switching elements, each provided for a different photoelectric element, for supplying, to the photoelectric elements, currents matching with the video data signals supplied from the video data signal lines, and further includes path selector switching elements, connected to the respective drive-switching elements, for selecting one of current injecting paths according to a scan signal from the scan signal lines, and a current measuring circuit to either one of the current injecting paths.

Description

field of invention [0001] The present invention relates to a matrix-arranged display and its driving method using self-luminous devices that supply current to emit light by themselves as pixels. Background of the invention [0002] In recent years, the development of thin displays using self-luminescent elements such as organic electroluminescence (EL) and field emission (FED) has been actively developed. [0003] As we all know, in this type of self-luminous element, the luminous brightness of the element is proportional to the current density flowing through the element. Also, in such an element, element characteristics (such as volt-ampere characteristics) vary, and it is difficult to adjust luminance by adjusting an applied voltage, and it is desirable to perform current driving using a constant current. [0004] For example, it has been disclosed in the Japanese publication No. 10-319908 (disclosure date December 4, 1998, corresponding to U.S. Patent No.5, NO.952, NO.7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B44/00G09F9/30G09G3/20G09G3/22G09G3/30G09G3/32H01L51/50H05B33/14
CPCG09G2300/0842G09G2310/0262G09G2320/029G09G3/3233G09G3/20
Inventor 田川晶沼尾孝次
Owner SHARP KK