JPH03102320A - Image input and output device - Google Patents

Abstract

PURPOSE:To reduce the size of the image input and output device and to reduce its power consumption by providing a switch for a liquid crystal shutter array and a driving circuit for a shift register integrally on a substrate, and forming the driving circuit of a CMOS. CONSTITUTION:A life-size photosensor (TFT driving circuit integrated type) 2 for the life-size type liquid crystal shutter array is arranged, the liquid crystal shutter array (TFT driving circuit integrated type) 3 is arranged below it, and a light source 4 for supply is provided between them. Further, The life-size sensor, a clock signal generating circuit 10 for the liquid crystal shutter array, and a read circuit 9 for the life-size sensor are arranged on a flank of a unit. Then, an inverter to be arranged on the driving circuit is formed of CMOS. Consequently, the unit size of the liquid crystal shutter array can be reduced and low power consumption and a low driving voltage can be realized by the use of the COMS.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image input/output device, and more particularly to an image input/output device for facsimiles and digital color copies. The present invention is also applied to, for example, computer input/output devices and word processors.

The prior art related to the present invention is described below. Kouhei Saitoh, Hisashi Ao
ki, Koh Fujifmura, etc. rDe
Velopmant of a High-Speed
and}1ight"Rasolution Liqu
id-Crystal shutter forPri
based on Dual-Freque
ncy AddressSedG-11 ModaJ
(SID digest.l986.p262) According to this, since the LCD shutter printer does not have a built-in drive circuit, the size of the printed circuit board for the housing circuit is bulky, and as a result, it is not possible to reduce the printer unit size. There are drawbacks. Also +F. Okumura, K. Sera, ate r
Fsrrcoelectric liquid-crys
tal shutter array t#ith P
oly-SiTFT driverJ (Inter
national display research
conferenceee. 1988. P174) has an 8-bit decoder for the liquid crystal shutter, but this makes high-speed processing difficult. Also, an Nch E/D inverter is used,
In this case, sufficient output for supply may not be obtained and printing quality may deteriorate.

Furthermore, the previously proposed "semiconductor device" uses a dynamic shift register as a deactivation circuit for a 1-magnification sensor, and is not used in the liquid crystal shutter array of the present invention. However, since a constant voltage is used for the power supply voltage of the analog switch, it cannot be used for liquid crystal shutter arrays.

The present invention has been made in order to solve the above-mentioned drawbacks.Regarding claim 1, in the case where the liquid crystal shutter array does not have a built-in motion circuit, the area occupied by the drive circuit section is Due to this trend, it is difficult to make the unit more compact, so this can be achieved by creating the liquid crystal shitter array and the housing circuit on the same board.

Regarding claim 2, the problem with integrating the liquid crystal shutter array and the same-magnification sensor is that the unit size increases due to the light source. Previously, two light sources were required, one for each liquid crystal shutter array and one for the 1x sensor. The present invention aims to reduce the unit size by sharing a light source.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned objects, the present invention has been made to (1) form a driving circuit on a substrate including a switch and a shift register for controlling the liquid crystal shutter array in a same-size liquid crystal shutter array; The inverter formed in the drive circuit is made of CMOS, or (2) the same-size liquid crystal shutter array and the same-size image sensor share a supply light source. It is. The following is a description based on embodiments of the present invention.

Figure 1 is. This is a configuration diagram for explaining an embodiment of an image input/output device according to the present invention. In the figure, 1 is a reading document, 2 is a full-contact equal-magnification sensor, 3 is a liquid crystal shutter array, and 4 is a configuration diagram for explaining an embodiment of an image input/output device according to the present invention.
5 is a light source (Xs lamp), 5 is a photoconductive drum (photoreceptor)
, 6 is a power supply circuit, 7 is a control circuit, 8 is a timing synchronization circuit, and 9 is a same-size sensor reading circuit. 10 is a clock signal generation circuit. In the state shown in the figure, there is a 1x optical sensor (TFT (Thin)
A liquid crystal shutter array (TFT (integrated with dynamic circuit) 3) is disposed at the bottom thereof, and a light source 4 for supplying light is provided to sandwich them. Further, a clock signal generation circuit 10 for controlling the equal-magnification sensor and the liquid crystal shutter array, and a reading circuit 9 for the equal-magnification sensor are arranged on the side of the unit. The circuits of the equal-magnification sensor 2 and the liquid crystal shutter array 3 are constructed in such a way that they can be shared as much as possible.

For example, a typical example is a control clock signal. The driving circuits used in the line-type liquid crystal shutter array 3 can be divided into static shift registers and dynamic shift registers. Static shift registers have high stability against clock power supply voltage and clock signal distortion. However, the circuit structure tends to be complicated and the number of transistors used is large.

In contrast, a dynamic shift register can be constructed with a small number of transistors.

FIG. 2 is a diagram showing the configuration of a drive circuit used in claim 1, in which 2l is a liquid crystal counter electrode, 22 is a liquid crystal electrode, 2
3 is an analog switch (PchT F 'I'').It mainly consists of a shift register for driving and an analog switch that supplies charge to the liquid crystal shutter.And since the liquid crystal is driven by AC, it is necessary to supply electric charge to the analog switch. The power source for this is an alternating current voltage, which has the opposite polarity and 1.80 degree phase difference from the potential applied to the opposing electrode of the liquid crystal.

Figure 3 shows a circuit diagram of a static shift register and a dynamic shift register as rotating circuits used in this configuration. Figure (a) shows a dynamic shift register, and figure (b) shows a static shift register. Here, we will discuss the operating principle of a dynamic shift register based on [ (.). lbit is configured by two stages of CMOS inverters. Of the two CMOS inverters, the one marked A in the figure is a clock synchronous type that operates with a two-phase clock, and the one marked B in the figure is an inverter that is not affected by the clock. Figure 4 shows a layout in which a dynamic shift register is constructed using TPT. The lower part of the figure is the clock synchronous CMOS inverter, and the upper part is the CMOS inverter.
FIG. 5(a) is a diagram explaining the operation of the dynamic shift register using 3 bits. In the shift register, bits operated by the clock Φ are arranged alternately. Here, bitl and bit3 operate with clock Φ. b
it2 operates with clock Φ. Output Bl of each bit,
B2 and B3 become sensor read signals. Figure 5(b)
is the case of a static shift register.

FIG. 6 shows a time chart of the operation of the dynamic register shown in FIG. 5(.). First, at time A, input the signal to start sensor reading. At this point, the clock Φ
= 'H', bitl, bit3 is inactive, bit2
is activated, and a read signal appears on B2. time C
In this case, the operating situation is the same as in A, and the readout Shinchin appears in B3.

FIG. 7 is a diagram showing a cross-sectional structure of a liquid crystal shutter array according to claim 1 of the present invention, in which 31 is light, 32.43 is a polarizing plate, 33.38 is ITO, 34 and 42 are quartz substrates, 3
5 is an alignment film, 36 is a ferroelectric (Fer)
ro electric) LCD, 37 is AQ, 39 is P
+ Diffusion layer. 40 is a gate, and 41 is a Pch analog switch. The analog switch 41 is connected to the liquid crystal electrode 36 via AQ and ITO, and a counter electrode is formed above it. A deflection plate 43 necessary for the liquid crystal shutter array is formed on the upper surface of the glass substrate.

Here, in order to compare claims 1 and 2 with conventional examples, FIG. 8 shows a conventional unit structure in which a 1-size sensor and a liquid crystal shutter array are integrated. In the figure, 52 is a full-contact 1-magnification sensor, 53 is a liquid crystal shutter array, and 54
is an Xs lamp, 55 is a fluorescent lamp, and 56 is 1! source circuit,
57 is a control circuit, 58 is a synchronization circuit (control circuit), 59 is a reading circuit, and 60 is a clock signal generation circuit. According to this figure, it can be seen that the unit structure of the present invention shown in FIG. 1 above is much smaller.

Figure 9(a). (b) is a diagram showing a comparison of claim 1 of the present invention with a conventional example, where (a) is an enhancement/enhancement (E/E) inverter;
indicates a CMOS inverter.

FIGS. 10(a) and 10(b) are diagrams showing the response characteristics of the inverter circuit of FIG. 9. Figure (a) shows the input voltage waveform, and Figure (b) shows the output voltage waveform. In addition, Table I shown below shows the W/W/E inverter load side.
Examples of changing L and the optimum values are shown, and Table 2 shows examples of changing W/L on the moving side of an E/E inverter and the characteristics of a CMOS inverter. (Left below) Figures 9 and 10, Tables 1 and 2 above show the response speed of each stage of the inverter when the inverter is configured with a Pch enhancement/enhancement type inverter. Also, the current consumption and inverting voltage at that time are similarly shown. For comparison, the characteristics of the CMOS inverter used in the present invention are listed below.
In this way, in order to achieve the same response speed as a CMOS inverter, the Nch enhancement-enhancement type inverter has no choice but to endure performance deterioration in supply voltage and current consumption. Also, compared to CMOS.
The E/E inverter has a high supply voltage (VD+1-
Vss435V) is required, and the current consumption is 6 orders of magnitude larger (2.4X10''3W). Figure 11(a)
, (b) shows a structural diagram of TPT used in the present invention in claim 1. Figure (a) is a plan view, and figure (b) is a sectional view taken along line nn in figure (a). In the figure, 61 is a gate electrode, 62 is a source electrode, 63 is a drain electrode, 64 is a contact,
65 is a gate electrode [i (PolySi) . 6 6
Is it the gate oxide film? 67 is an active layer (Poly
Si). 68 is an interlayer insulating film (SiO■), 69 is a metal, and 70 is a P.I. N-enlarged #IIM, 71 is a quartz substrate. As is clear from the above explanation, the present invention has the following effects. (1) Since the driving circuit can be integrally formed on the substrate of the liquid crystal shutter array according to claim 1, the unit size of the liquid crystal shutter array can be reduced, and the inverter can
Since MOS can be used, low power consumption and low drive voltage can be achieved. Furthermore, by adopting a CMOS configuration for the idle circuit, it is possible to configure a circuit that is faster and consumes less power than a conventional Nch drive circuit, and high-speed writing and high reliability can be achieved. In addition, high reliability can be achieved by using CMOS to eliminate high voltage fluctuations that are often seen in E/D inverters. (2) By integrating the same-magnification type sensor of claim 2 and the light source of the liquid crystal shutter array, the unit size as an image input/output device is reduced, and compactness has progressed.

[Brief explanation of drawings]

FIG. 1 is a block diagram for explaining one embodiment of an image input device according to the present invention, FIG. 2 is a diagram showing a decommissioning circuit used in claim 1, and FIGS. b) is a diagram showing a shift register, FIG. 4 is a diagram showing an example of a dynamic shift register configured with TPT, and FIGS. 5(a) and (b)
is a diagram for explaining the operation of the shift register using bits, FIG. 6 is a diagram showing a time chart of the dynamic shift register shown in FIG. 5, and FIG. 7 is a diagram for explaining the operation of the shift register using bits. FIG. 8 is a diagram showing a conventional example in which a 1-size sensor and a liquid crystal shutter array are integrated, FIG. 9(a) and (b) are diagrams showing an inverter circuit, and FIG. 10 ( 11(a) and 11(b) are diagrams showing the response characteristics of the inverter circuit, and FIGS. 11(a) and 11(b) are structural diagrams of the TPT used in claim 1. DESCRIPTION OF SYMBOLS 1... Original document to be read, 2... Full contact 1x sensor, 3... Liquid crystal shutter array, 4... Light source, 5...
...Photoconductive drum, 6.. Power supply circuit, 7.. Control circuit, 8.. Timing synchronization circuit, 9.. Same size sensor reading circuit, 10.. Clock signal generation circuit.

Claims (1)

[Scope of Claims] 1. In a same-size liquid crystal shutter array, a drive circuit including a switch and a shift register for controlling the liquid crystal shutter array is formed on a substrate, and an inverter formed in the drive circuit is made of CMOS. An image input/output device characterized by: 2. An image input/output device characterized in that a same-size liquid crystal shutter array and a same-size image sensor share a supply light source.