JPS62122397A - Color television system - Google Patents

Abstract

PURPOSE:To miniaturize and lighten a color television and to reduce the deterioration in a picture quality by arranging a liquid crystal constituting a picture element two-dimensionally, transmitting a video signal outputted by an image pickup element to a liquid crystal color display element and driving the corresponding crystal every picture element. CONSTITUTION:In the CCD image pickup element 13, a CCD image pickup element driving circuit 17 is operated by the pulse from a pulse generating circuit 15 to amplify a signal charge and from a horizontal transfer CCD, thereafter, feeds it to an amplifier 14 as the video signal, amplifiers to a prescribed level and supplies to the liquid crystal color display element 200 in which the solid-state image pickup element 13 including a color filter 12 corresponds with the picture elements of the display element by one-to-one. Then, according to the pulse from the pulse generating circuit 15, a liquid crystal display element driving circuit 16 is operated, a prescribed line of a display part 20 is successively selected by a scanning circuit 18. A shift register 19 feeds the pulse to gate circuits 201, 202... provided correspondingly to the video signal from the CCD image pickup element 13 is fetched every picture element information and supplied to the display part 20 through amplifiers 301, 302....

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a color television system using color mm elements and color display elements.

[Technical Background of the Invention and Problems Therewith] Generally, as shown in FIG. 4, a conventional color television system converts optical information of a subject into an electrical signal using an optical element 2 of an imaging device 1, and then converts the optical information into an electrical signal. The processing circuit 3 obtains a standard color television signal from the three primary color information of light. Next, the standard color television signal is sent to the display device 4, separated into three primary color signals by the signal processing circuit 5, and then a color image is displayed using the electro-optic conversion characteristics of the display element 6. ing. However, in such conventional systems, a large-scale control circuit is required to convert the optical information of the subject into a standard color television signal using the Ii@ device 1, and furthermore, the standard color television signal In order to convert the image into a color image using the display device [4], a large-scale control circuit is required here as well, resulting in a problem that the scale of the entire system becomes large. In addition, the image sensor 2 and the display element 6
Image distortion occurs due to nonlinear processing to correct the gamma characteristics of the image, and the signal-to-noise ratio deteriorates due to the image signal passing through a large-scale signal processing circuit, which is another problem in terms of image quality.

[Object of the Invention] The present invention was made in order to improve the above-mentioned problems, and it is an object of the present invention to provide a color television system that is small and lightweight and has little deterioration in image quality.

[Summary of the Invention 1 That is, the color television system according to the present invention has a plurality of light receiving elements arranged in a two-dimensional array, a color filter is formed on each light receiving element, and the signal charge stored in each light receiving element is sequentially transmitted. A color solid-state image carrier that generates a video signal by vertical and horizontal transfer, and this color solid-state ll1l
A liquid crystal color display element comprising a two-dimensional array of liquid crystals constituting a number of pixels having a predetermined correspondence with the number of pixels of the liquid crystal element, and a color filter formed on each liquid crystal, and an output from the color solid-state carrier element. and a control means for transmitting a video signal to the liquid crystal color display element to drive a corresponding liquid crystal for each pixel of the liquid crystal color display element, and in particular, for controlling the color solid-state image element. The number of light receiving elements of the color solid-state image sensor and the number of liquid crystals of the liquid crystal color display element are equal in both vertical and horizontal directions, and the predetermined correspondence between each pixel constituted by the light receiving element of the color solid-state image sensor and the liquid crystal of the liquid crystal color display element. The present invention is characterized in that the relationship is one to one, and that the photoelectric conversion characteristics of the color solid-state image element and the electro-optic conversion characteristics of the liquid crystal color display element are both in a linear relationship.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3.

FIG. 1 shows its configuration, in which 11 is an am lens, 12 is a color filter, and 13 is a solid-state image sensor. The solid-state image sensor 13 is, for example, a charge-coupled device (hereinafter CCDIfi).
A color filter 12 is formed on the photosensitive surface of the image element. Here, the combination of the color filter 12 and the solid-state image sensor 13 is referred to as a solid-state color image sensor.

The optical image incident through the imaging lens 11 passes through the color filter 12 and is then formed on the photosensitive surface of the CCD111 image element 13. The CGDItllil element 13 has, for example, 500 pixels arranged in the vertical direction and 800 pixels in the horizontal direction, and as shown in FIG. 2, two light receiving elements 22. 23 are correspondingly provided. The color filter 12 used here has an RGB vertical stripe shape,
The light receiving elements 22, 24, and 25 constituting one pixel respond only to incident light in the red (R), green (G), and dark (B) wavelength ranges, respectively.

In the CGDIiii1m element 13, when the CCOM image element drive circuit 17 is operated by the pulse from the pulse generation circuit 15, the signal charge of the light receiving element 22 or 23 is vertically changed to the vertical blanking period every other line in odd and even fields. The data is read out to the transfer CCD 21 and sequentially transferred in the vertical direction during the horizontal blanking period. Then, the signal charge transferred to the R final stage of vertical transfer COD 21 is horizontally transferred to C0D2 during the horizontal blanking period.
6 and transferred horizontally at high speed. The signal charge read out from the horizontal transfer COD 26 is transferred to the amplification section 27.
After being amplified, the signal is sent to the amplifier 14 as a video signal via the output terminal 28. In this way, CCDI! The video signal obtained from the l image element 13 is transmitted to the COD image element 1.
Since the three-voltage conversion characteristic is linear, the signal level is proportional to the level of incident light. This video signal is amplified to a predetermined level by the amplifier 14 and then supplied to the liquid crystal color display element 200.

This liquid crystal color display element 200 includes a scanning circuit 18, a shift register 19, and gate circuits 201, 202, 203.
.

..., amplifiers 301, 302, 303, ...
and a liquid crystal display section 20. Liquid crystal display section 2
0 is a thin film transistor (hereinafter T
PT) 33, an auxiliary storage pixel capacitor 34 for increasing pixel capacity, and a liquid crystal 35. The display circuit is arranged vertically and horizontally. The number of pixels is exactly the same as that of the CCD image sensor 13, 500 pixels in the vertical direction and 800 pixels in the horizontal direction, and the color filter is also exactly the same as the CC0w image sensor 13, in the form of RGB vertical stripes. It becomes. This liquid crystal color display element 200 operates when the liquid crystal display element drive circuit 16 is operated by the pulse from the pulse generation circuit 15.
The scanning circuit 18 and shift register 19 are driven, and the scanning circuit 18 sequentially selects predetermined lines of the display section 20 shown in FIG. 3. The TPT of the selected line is the third
When the gate electrode wirings 31 and 32 shown in the figure become high level, they become conductive.

On the other hand, the shift register 19 selects pixel information in the horizontal direction, and the gate circuit 2 provided corresponding to each pixel.
This is to send a pulse to 01, 202, 203, . . . to make them conductive in order, and to take in the movie signal from the CCD 1lii image element 13 for each pixel information.

The pixel information taken in by each gate circuit 201, 202, 203, . . . is transferred to an amplifier 301,
302.

303, . . . This amplifier 301, 3
02.

303, . . . are for maintaining the white balance of the display, and the respective amplification factors are set in advance to three types corresponding to the R, G, and B pixels. Each piece of pixel information selected in this way is supplied to the display section 20, and then to the auxiliary storage pixel capacitor 34 coupled to the TPT in a conductive state. The signal charges charged here continue to excite the liquid crystal 35 until the next frame is scanned. Note that since the display section 20 requires alternating current driving, the polarity of the output signal of the amplifier 14 is inverted every frame by an alternating current video waveform forming circuit 161. Further, the electro-optical conversion characteristics of the liquid crystal display section 20 are arranged to have a linear relationship with the photoelectric conversion characteristics of the CCD 1i image element 13.

That is, in the color television system configured as described above, conventionally, an imaging device generates three primary color signals, converts them into a standard color television signal, and a display device decomposes this signal back into the original three primary color signals. In contrast, the solid-state Il image element 13 and liquid crystal display section 20
Since there is a one-to-one correspondence between the pixels of the 0 display element including the color filter, there is no need for any intermediate signal processing circuit. This allows the color television system to be significantly smaller and lighter. In addition, since the nonlinear signal processing circuit in the middle can be omitted, distortion of the video signal is eliminated and the S/N
The deterioration of the ratio is also reduced and the image quality is significantly improved.

Therefore, according to the above configuration, the color television system can be made smaller and lighter, and the image quality can be improved.

In the above embodiment, a ccomm element is used as the solid-state ifi image element, but other solid-state 11tl+ elements such as an IQs type me element or a CPD image sensor may also be used. Further, although the liquid crystal color display element 200 has been described using an active matrix drive method, other drive methods such as static drive may be used. Although TPT has been roughly described as a switch element, other switch elements such as a nonlinear two-terminal element may also be used. Furthermore, the number of pixels is not limited to 500 pixels in the vertical direction and 800 pixels in the horizontal direction. Furthermore, the arrangement of the color filters is not limited to the vertical strip type, but may be any other arrangement. However, in this case, a separate white balance circuit is required. That is, this invention can be modified in various ways without departing from the gist thereof.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a color television system that is small and lightweight and exhibits little deterioration in image quality.

[Brief explanation of drawings]

FIG. 1 is a block circuit configuration diagram showing an embodiment of a color television system according to this first invention, FIG. 2 is a schematic circuit diagram showing the configuration of a CCD image sensor used in the same embodiment, and FIG. FIG. 4 is a schematic block diagram of the liquid crystal display section used in this embodiment, and is a block circuit diagram of a conventional color television system. 11... Imaging lens, 12... Color filter, 13.
...COD@image element, 15...pulse generation circuit, 16
．． 17... Drive circuit, 18... Scanning circuit, 19...
・Shift register, 20...Liquid crystal display section, 200...
・Liquid crystal color display element, 201°202, 203,
......Gate circuit, 301, 302, 303
. ......Amplifier, 21...Vertical transfer CCD, 22
．． 23.24° 25... Light receiving element, 26... Horizontal transfer CCD, 27... Amplifier, 33... TFT, 34
...Pixel capacitor for auxiliary memory, 35...Liquid crystal. Applicant's agent Patent attorney Takehiko Suzue 4th grade

Claims (3)

[Claims] (1) Color solid-state imaging that generates video signals by arranging multiple light-receiving elements two-dimensionally, forming color filters on each light-receiving element, and sequentially vertically and horizontally transferring the signal charges stored in each light-receiving element. a liquid crystal color display element in which liquid crystals constituting a number of pixels having a predetermined correspondence with the number of pixels of the color solid-state image sensor are arranged two-dimensionally, and a color filter is formed on each liquid crystal; A color television system comprising a control means for transmitting a video signal output from a solid-state image sensor to the liquid crystal color display element and driving a liquid crystal corresponding to each pixel of the liquid crystal color display element. (2) The number of light-receiving elements of the color solid-state image sensor and the number of liquid crystals of the liquid crystal color display element are equal in both the vertical and horizontal directions, and the light-receiving elements of the color solid-state image sensor and the liquid crystal of the liquid crystal color display element constitute 2. The color television system according to claim 1, wherein the predetermined correspondence between each pixel is one-to-one. (3) The color television system according to claim 1, wherein the photoelectric conversion characteristics of the color solid-state image pickup device and the electro-optic conversion characteristics of the liquid crystal color display device are both in a linear relationship.