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Printer head and image forming apparatus having the same

A technology of print head and pixel circuit, which is applied in image communication, printing, electric recording process applying charge pattern, etc., can solve the problems of space difficulty and the increase of the area occupied by the gate.

Inactive Publication Date: 2006-04-05
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a technical problem that if the area occupied by the gate in each pixel increases, it becomes more difficult to secure a space for the storage capacitor.
In addition, if the storage capacitor is too large, the time to write the data signal in the pixel becomes hundreds of ns, and there is another problem that it is difficult to write data in the pixel portion within the writing time.

Method used

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  • Printer head and image forming apparatus having the same
  • Printer head and image forming apparatus having the same
  • Printer head and image forming apparatus having the same

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0039] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0040] (Print Head)

[0041] Compare below Figure 1 to Figure 7 , while describing in detail the relevant printheads of this embodiment, and then comparing Figure 8 , a printer as an example of image display using the related print head of the present invention will be described. In addition, in the following embodiments, an organic EL light-emitting element as an example of a current-driven light-emitting element is mounted, and the organic EL light-emitting element (hereinafter referred to as a light-emitting element) is driven by a voltage programming method as an example. .

[0042] control figure 1 as well as figure 2 , the schematic configuration of the print head related to this embodiment will be described. figure 1 It is a perspective view schematically illustrating the configuration of a print head related to this embodiment, figure ...

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PUM

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Abstract

A printer head includes a plurality of current-driven light-emitting elements that are linearly disposed so as to expose a photosensitive member, and a plurality of pixel circuits, each having a driving transistor that is provided for each light-emitting element so as to cause a driving current to flow in the light-emitting element according to a data signal and a storage capacitor that holds an electric charge according to the data signal and having a gate of the driving transistor as one of a pair of capacitance electrodes and an interlayer insulating film interposed between the pair of capacitance electrodes as a dielectric film, such that a voltage according to the electric charge held in the storage capacitor is applied to the gate of the driving transistor.

Description

technical field [0001] The present invention relates to a printing head or a line head such as an organic EL (Electro-luminescence) printing head for exposing a photoreceptor to form an electrostatic latent image in an image forming device such as a printer, a copier, or a facsimile machine, and a printing head having the printing head or a line of image forming devices. Background technique [0002] In such an organic EL print head, lighting and non-lighting corresponding to data signals in a plurality of organic EL light-emitting elements arranged in a row are sequentially performed in accordance with the timing corresponding to the row scanning signal. Here, each pixel circuit is provided with an organic EL light-emitting element and a driving transistor for supplying a driving current thereto, and the driving transistor is turned on in response to a data signal to supply a driving current to the organic EL light-emitting element. Light emission corresponding to the data...

Claims

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Application Information

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IPC IPC(8): G03G15/043G03G15/04B41J2/447B41J2/435B41J2/44B41J2/45B41J2/455H01L51/50H04N1/036
CPCB41J2/45B41J2/0057
Inventor 北泽幸行
Owner SEIKO EPSON CORP