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Electro-optical device, driving method thereof and electronic equipment

The technology of an electro-optical device and a driving method, which is applied in the field of electro-optical elements, can solve problems such as circuit scale enlargement

Inactive Publication Date: 2011-03-09
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the structure of JP-A-2005-283816, since an arithmetic circuit for correcting gradation data based on the correction data is indispensable, there is a circuit arranged around the electro-optical element (hereinafter referred to as "periphery"). circuit") to increase the size of the problem

Method used

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  • Electro-optical device, driving method thereof and electronic equipment
  • Electro-optical device, driving method thereof and electronic equipment
  • Electro-optical device, driving method thereof and electronic equipment

Examples

Experimental program
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no. 1 approach

[0054] figure 1 It is a perspective view showing a partial configuration of an image forming apparatus using the electro-optical device according to the first embodiment of the present invention as an optical head (exposure device). As shown in the figure, the image forming apparatus includes an electro-optical device 10 , a condensing lens array (lens array) 15 and a photoconductor drum (drum) 110 . The electro-optical device 10 includes a plurality of electro-optical elements ( figure 1 illustration omitted). These electro-optical elements selectively emit light according to the state of an image to be printed on a recording material such as paper. The photoreceptor cylinder 110 is supported by a rotation shaft extending in the main scanning direction, and rotates in the sub scanning direction (the method in which the recording material is conveyed) with its outer peripheral surface facing the electro-optical device 10 .

[0055] The condensing lens array 15 is disposed...

no. 2 Embodiment approach

[0086] Next, a second embodiment of the present invention will be described. In addition, in each of the following embodiments, elements having the same action and function as those of the first embodiment are given the same symbols as above, and detailed descriptions thereof are appropriately omitted.

[0087] Figure 5 It is a block diagram showing the configuration of the electro-optical device 10 according to this embodiment. The electro-optical device 10 of the first embodiment, such as figure 2 Two selection circuits (a first selection circuit 21 and a second selection circuit 22 ) are shown. In contrast, as Figure 5 As shown, the electro-optical device 10 of the present embodiment includes only one selection circuit 20 as a mechanism for sequentially selecting the unit circuits U1 to Un. This selection circuit 20 , like the first selection circuit 21 and the second selection circuit 22 of the first embodiment, outputs selection signals S1 to Sn by sequentially shi...

Embodiment approach

[0093] As described above, in the present embodiment, since any one of the holding circuit 32 and the correction circuit 34 is selectively designated as an output destination of the selection signals S1 to Sn, only one mechanism for sequentially selecting the unit circuits U1 to Un is required. Circuit 20 is sufficient. Therefore, compared with the first embodiment in which two selection circuits (the first selection circuit 21 and the second selection circuit 22 ) are arranged, the structure of the electro-optical device 10 can be simplified and the manufacturing cost can be reduced. In addition, compared with the configuration of the first embodiment, there is an advantage that the electro-optical device 10 can be miniaturized by one selection circuit 20 .

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Abstract

An electro-optical device has a first selecting circuit for selecting, in order, each unit circuit, and a signal line, for supplying to a corrected data for each unit circuit. Each unit circuit includes: an electrooptical element having a greyscale corresponding to a drive current; a memory element for fetching and storing a corrected data from the signal line when the first selecting circuit selects the unit circuit; a current source transistor for producing a reference currrent of the current value corresponding to the corrected data stored in the memory element; and a drive transistor for producing a drive current by adjusting the reference current into the current value corresponding to the greyscale data.

Description

technical field [0001] The present invention relates to techniques for controlling various electro-optical elements such as organic light emitting diode (hereinafter referred to as "OLED (Organic Light Emitting Diode)") elements. Background technique [0002] Conventionally, an electro-optical device configured by arranging a plurality of unit circuits including an electro-optical element and a circuit for controlling the electro-optical element has been proposed. In such an electro-optical device, a plurality of electro-optical elements produces gray scales ( brightness) unevenness. In order to suppress such gradation unevenness, for example, Japanese Patent Laid-Open No. 2005-283816 discloses a method of correcting the gradation data (data specifying gradation) of each electro-optical element based on the correction data. A structure in which each electro-optical element is driven. [0003] However, in the structure of JP-A-2005-283816, since an arithmetic circuit for c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/30G09G3/32G09G3/20H05B33/08H05B33/14H05B37/02H01L51/50H01L27/32G09F9/33H05B44/00
CPCY02B20/42Y02B20/345
Inventor 藤川绅介城宏明
Owner SEIKO EPSON CORP