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Electric current generating circuit, electro optics apparatus and electronic machine

A technology for current generation circuits and electro-optical devices, which can be applied to circuits, electric light sources, lighting devices, etc., and can solve the problems of complicated circuits and difficulty in obtaining smooth gamma characteristics.

Active Publication Date: 2004-09-01
ELEMENT CAPITAL COMMERCIAL CO PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, the structure of (1) above has the problem of complicating the circuit; the structure of (2) has the problem of being difficult to obtain a smooth γ characteristic.

Method used

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  • Electric current generating circuit, electro optics apparatus and electronic machine
  • Electric current generating circuit, electro optics apparatus and electronic machine
  • Electric current generating circuit, electro optics apparatus and electronic machine

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Embodiment Construction

[0048] Below, with reference to the accompanying drawings, the embodiments of the present invention will be described. FIG. 1 is a diagram showing the configuration of a current generating circuit according to the embodiment.

[0049] As shown in the figure, the current generation circuit 10 includes a D / A conversion circuit that inputs digital data Dpix that linearly defines, for example, the gradation of a pixel, and generates a current signal that has a linear characteristic relationship with the data. 20; and a non-linearization circuit 40 that converts the current signal into a current that has a relationship of a non-linear characteristic and outputs it.

[0050] In addition, for the convenience of description, the digital data Dpix is ​​set to 6 bits, and the gradation is defined by dividing it into 64 (2 to the 6th power) levels from "0" to "63" in decimal numbers.

[0051] In addition, in this embodiment, the current generation circuit 10 refers to a combination of t...

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PUM

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Abstract

To make circuit configuration simple and to obtain a current I<2>having a smooth nonlinear characteristic to a current I<1>. One-end sides of resistances 41 and 42 having mutually different resistance values are connected to an electrification terminal Nd to which a source voltage V is supplied. The source of a transistor 51 is connected to the other end of the resistance 41 and also connected to the gate in a saturation basis. The source of a transistor 52 is connected to the other end of the resistance 42 and its gate is connected to the saturation-connected gate of the transistor 51. A current I<2>flowing to the transistor 52 is represented as a function shown by the square of a current I<1>flowing to the transistor 51, so its characteristic is a smooth nonlinear characteristic. G09G 3 / 30 G05F 3 / 26 H03G 3 / 10 H03G 3 / 04 18 14 3 2004 / 2 / 2 1525427 2004 / 9 / 1 100412928 2008 / 8 / 20 2008 / 8 / 20 2008 / 8 / 20 Seiko Epson Corp Japan Kasai Toshiyuki li xianglan 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2003 / 2 / 28 2003-054012

Description

technical field [0001] The present invention relates to a current generating circuit, an electro-optical device and an electronic device suitable for driving a display such as an organic EL (Electronic Luminescence) display. Background technique [0002] In recent years, an organic EL display has attracted attention as a next-generation display. The reason is that the liquid crystal element in the liquid crystal display only changes the amount of light transmitted. Unlike this, the organic EL display is a self-luminous element that emits light itself. In addition, compared with liquid crystal displays, organic EL displays have advantages such as wide viewing angles, high contrast ratios, and fast response speeds. Here, since the organic EL display is a so-called current-driven device, unlike a voltage-driven liquid crystal device, it is necessary to generate a current corresponding to the gradation (brightness) instead of a voltage when driving. For this reason, a current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50G09G3/20G09G3/30G09G3/32G09G5/00H05B33/14
CPCG09G2300/0842G09G3/325G09G2310/027G09G3/3283G09G3/30
Inventor 河西利幸
Owner ELEMENT CAPITAL COMMERCIAL CO PTE LTD
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