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Electronic circuit device

A technology of electronic circuits and electronic signals, applied in circuits, logic circuits, logic circuits using optoelectronic devices, etc., can solve problems such as noise and failure

Inactive Publication Date: 2008-09-03
SEMICON ENERGY LAB CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to solve problems such as the occurrence of noise and failure caused by such electromagnetic waves

Method used

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Experimental program
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Effect test

Embodiment approach 1

[0076] The light sensor is described in detail below. Figure 4 A circuit diagram of a light sensor portion according to the present invention is shown. In this embodiment, the light sensor consists of a photodiode. Refer below Figure 4 To describe the work of the light sensor part. First, a reset pulse is input into the reset transistor 405 . Here, since a P-channel (hereinafter referred to as Pch) TFT is used as this reset transistor, the signal is low. When the reset transistor 405 is turned on, the cathode potential of the photodiode 401 is raised to the potential level of the power supply. At this time, the storage capacitor of the capacitor 402 is also raised to the potential level of the power supply. When the capacitance of the photodiode 401 is large, the storage capacitor of this capacitor 402 may not be installed intentionally. Next, the reset pulse goes high, and the reset transistor 405 is turned off.

[0077] In the case where no light is input, the cathode...

Embodiment approach 2

[0083] In this embodiment, a liquid crystal is used to form an optical shutter. As is generally known, liquid crystal panels are fabricated by injecting liquid crystal material into liquid crystal gold gaps with a width of a few micrometers, the transmission of light is controlled by an applied voltage, and the liquid crystals are thus used as optical shutters. The entire surface of the substrate does not have to function as a liquid crystal, but since the manufacture of the substrate becomes easier when the liquid crystal is injected over the entire substrate surface in this embodiment, the liquid crystal has been injected. Although the manufacture becomes complicated, it is also possible to employ a structure in which the liquid crystal is cleared from the light input region. In this case, only the portion where the optical shutter exists is surrounded by the sealing material, and the liquid crystal can be injected only into this portion.

[0084] Fig. 8 shows a circuit dia...

Embodiment approach 3

[0090] The various steps according to the present invention are described below with reference to the sectional view of FIG. 10 . In FIG. 10, the optical sensor is composed of TFT and amorphous silicon photodiode, and the optical shutter is composed of liquid crystal. In this embodiment, TFTs and photodiodes are fabricated by the following methods. First, a coating film 1002 is formed on a glass substrate 1001 . An oxide film or a nitride film is formed as this film by a chemical vapor deposition method (hereinafter referred to as CVD method). Next, amorphous silicon is similarly formed into a film by the CVD method. This amorphous silicon film is crystallized by laser annealing method or thermal annealing method. In this way, a polysilicon (p-Si) film can be formed. Next, TFT islands 1003, 1004, 1005 are formed by patterning the polysilicon film. A gate insulator 1006 is then formed by the CVD method.

[0091] Then, as a method for forming the gate electrode, a metal to...

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PUM

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Abstract

An object of the present invention is to provide an electronic circuit device capable of reducing the occurrence of electromagnetic waves associated with the propagation of a signal by utilizing light as a signal. The electronic circuit device has a transparent substrate (hereinafter written as a substrate) over which an optical sensor and an optical shutter and an electronic circuit composed of thin film transistors (TFTs) are formed. An optical signal is inputted from an external into the electronic circuit device, the optical signal is directly irradiated on the optical sensor over the substrate, and penetrates through the substrate, and inputted into an optical sensor over another substrate. The optical sensor converts the optical signal into an electronic signal, and the circuit over the substrate operates. A control signal controls the optical shutter, a light is inputted from the external into this optical shutter, and whether it is transmitted or it is interrupted is determined, whereby the signal is taken out.

Description

technical field [0001] The present invention relates to an electronic circuit device for light input, in particular to a thin film transistor (hereinafter referred to as TFT) by means of a transparent substrate such as a substrate made of quartz, glass, plastic, etc. And the composition of the electronic circuit device for light input. Furthermore, the present invention also relates to electronic devices such as computers composed of such electronic circuit devices. Background technique [0002] Currently, with the improvement of electronic devices, informatization has made further progress. This trend will further intensify in the future. Generally, an electronic circuit device constituting a widely used electronic device has a circuit on a printed circuit board (also referred to as a printed circuit board, hereinafter referred to as a printed circuit board). Specifically, metal such as copper (Cu) is plated on a substrate (also called a board) made of glass epoxy resin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1362H01L29/786H01L31/00G02F1/01G02B6/43G02F1/13G02F3/00H01L21/336H01L27/14H01L27/144H01L31/10H04B10/11H04B10/40H04B10/50H04B10/60H04B10/67H04B10/80
CPCG02B6/43G02F3/00
Inventor 今井繁规永井知幸山崎舜平小山润
Owner SEMICON ENERGY LAB CO LTD
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