JPH0584997B2 - - Google Patents

Description

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

[Technical background of the invention and its problems] Generally, as shown in FIG. 4, a conventional color television system converts optical information of a subject into an electrical signal using an image sensor 2 of an image sensor 1, and then
The signal 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-optical 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 imaging device 1, and furthermore, a large-scale control circuit is required to convert the optical information of the subject into a 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, non-linear processing to correct the gamma characteristics of the image sensor 2 and display element 6 causes image distortion, and the image signal passes through a large-scale signal processing circuit, which deteriorates the signal-to-noise ratio. There were also some problems.

[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] That is, the color television system according to the present invention includes a pulse supply unit that outputs a predetermined transfer pulse, and a plurality of light receiving elements each having a color filter on a photosensitive surface, forming a pixel and transmitting a two-dimensional image. A color solid-state image sensor that generates a signal having color image information by sequentially vertically and horizontally transferring signal charges arranged in each light-receiving element and stored in each light-receiving element using the transfer pulse, and a transfer signal output from the color solid-state image sensor. Regarding the signal, a signal processing section adjusts the white balance by individually controlling the level of the transfer output component of each light receiving element, and a plurality of color display elements each having a color filter on a light emitting surface receives light from the color solid-state image sensor. The color display elements are arranged two-dimensionally in a predetermined correspondence relationship with the pixels formed by the elements, and each color display element is driven by the transfer pulse, so that each color display element receives the color from the signal processing section. and a color display section that performs color display by electro-optically converting the transfer output of the corresponding light receiving element of the solid-state image sensor, and the photoelectric conversion characteristics of the color solid-state image sensor and the electro-optic conversion characteristics of the color display section are mutually different. It is characterized by having a relative linear relationship. In particular, the number of light-receiving elements of the color solid-state image sensor and the number of color display elements of the color display section are equal in both the vertical and horizontal directions, and the pixels formed by the light-receiving elements of the color solid-state image sensor and the color The predetermined correspondence relationship between the pixels formed by the color display elements of the display section is one to one.

[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 imaging lens, 12 is a color filter, and 13 is a solid-state image sensor. The solid-state image sensor 13 is composed of, for example, a charge-coupled device (hereinafter referred to as a CCD image sensor), and has a color filter 12 formed on its photosensitive surface.
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 a color filter 12 and then is transferred to a CCD imaging device 1.
The image is formed on the photosensitive surface of 3. CCD image sensor 13
For example, 500 pixels in the vertical direction and 800 pixels in the horizontal direction are arranged, and as shown in Figure 2, vertical transfer is performed for television interlacing.
Two light receiving elements 22 and 23 are provided corresponding to one of the CCDs 21. The color filter 12 used here is an RGB vertical stripe type, and the light receiving elements 22, 24, and 25 constituting one pixel receive incident light in each wavelength region of red (R), green (G), and blue (B). It is designed to respond only to

In the CCD image sensor 13, when the CCD image sensor drive circuit 17 is operated by a pulse from the pulse generation circuit 15, the signal charge of the light receiving element 22 or 23 is changed every other line in the odd field and even field during the vertical blanking period. The data is read out to the vertical transfer CCD 21 and sequentially transferred in the vertical direction during the horizontal blanking period. Then, the signal charges transferred to the final stage of the vertical transfer CCD 21 are read out to the horizontal transfer CCD 26 during the horizontal blanking period and transferred in the horizontal direction at high speed. The signal charges read out from the horizontal transfer CCD 26 are amplified by the amplifier 27 and then sent to the amplifier 14 as a video signal via the output terminal 28. The video signal obtained from the CCD image sensor 13 in this way is
Since the photoelectric conversion characteristic of the CCD image sensor 13 is linear, the signal level is proportional to the amount 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 1
8, shift register 19, gate circuit 201, 2
02, 203, ..., amplifiers 301, 302, 30
3, . . . and a liquid crystal display section 20.
As shown in FIG. 3, the liquid crystal display section 20 has a front circuit consisting of a thin film transistor (hereinafter referred to as TFT) 33, an auxiliary storage pixel capacitor 34 for increasing pixel capacity, and a liquid crystal 35 arranged vertically and horizontally. It is composed of The number of pixels is exactly the same as the number of pixels of the CCD image sensor 13,
It has 500 pixels in the vertical direction and 800 pixels in the horizontal direction, and the color filter is exactly the same as the CCD image sensor 13 and is in the form of RGB vertical stripes.
In this liquid crystal color display element 200, when the liquid crystal display element driving circuit 16 is operated by a pulse from the pulse generating circuit 15, the scanning circuit 18 and the shift register 19 are driven, and the scanning circuit 18 causes the liquid crystal display element shown in FIG. Predetermined lines on the display section 20 are sequentially selected. The TFT of the selected line is the third
When the gate electrode wiring 31 shown in the figure becomes high level, it becomes conductive.

On the other hand, the shift register 19 selects pixel information in the horizontal direction, and sends pulses to the gate circuits 201, 202, 203, etc. provided corresponding to each pixel to sequentially turn on the CCD image sensor 1.
This is for capturing the video signal from 3 for each pixel information. Each gate circuit 201, 202, 20
The pixel information taken in by 3, . . . is supplied to amplifiers 301, 302, 303, .
These amplifiers 301, 302, 303, . . . are used to maintain the white balance of the display, and their 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 manner is supplied to the liquid crystal display section 20, and then to the auxiliary storage pixel capacitor 34 coupled to the TFT in a conductive state. The signal charge charged here continues to excite the liquid crystal 35 until the next frame is scanned. Since the liquid crystal 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. Furthermore, the electro-optical conversion characteristics of the liquid crystal display section 20 are designed to have a linear relationship with the photoelectric conversion characteristics of the CCD image sensor 13.

That is, in the conventional color television system configured as described above, 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. However, since the solid-state image sensor 13 and the pixels of the display element of the liquid crystal display section 20 have a one-to-one correspondence including the color filter, there is no need for an intermediate signal processing circuit. . This makes the color television system significantly smaller and lighter. Furthermore, since a nonlinear signal processing circuit in the middle can be omitted, distortion of the video signal is eliminated, deterioration of the S/N ratio is reduced, and image quality is significantly improved.

Therefore, with 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 CCD image sensor is used as the solid-state image sensor, but other solid-state image sensors such as a MOS image sensor or a CPD image sensor may be used. Furthermore, 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. Furthermore, although TFT has been 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. Further, the arrangement of the color filters is not limited to the vertical stripe 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 the drawing]

FIG. 1 is a block circuit configuration diagram showing an embodiment of a color television system according to the present 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 a liquid crystal display section used in the embodiment. FIG. 4 is a block circuit diagram of a conventional color television system. 11...imaging lens, 12...color filter, 13...
CCD image sensor, 15... pulse generation circuit, 16,
17... Drive circuit, 18... Scanning circuit, 19... Shift register, 20... Liquid crystal display unit, 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 storage, 35...Liquid crystal.

Claims (1)

[Scope of Claims] 1. A pulse supply unit that outputs a predetermined transfer pulse, and a plurality of light receiving elements each having a color filter on a photosensitive surface, which are arranged two-dimensionally to form pixels, and each light receiving element stores a pulse. A color solid-state image sensor that sequentially transfers signal charges vertically and horizontally using the transfer pulse to generate a signal having color video information; and a transfer output component of each light-receiving element for the transfer signal output from the color solid-state image sensor. a signal processing unit that adjusts the white balance by individually controlling the level of the color image sensor; and a plurality of color display elements each having a color filter on a light emitting surface arranged in a predetermined manner with the pixel formed by the light receiving element of the color solid-state image sensor. Each color display element is driven by the transfer pulse, and the corresponding light receiving element of the color solid-state image sensor is transferred from the signal processing section to each color display element. and a color display section that performs color display by electro-optically converting output, wherein the photoelectric conversion characteristics of the color solid-state image sensor and the electro-optic conversion characteristics of the color display section are in a linear relationship relative to each other. A color television system featuring 2. The number of light-receiving elements of the color solid-state image sensor and the number of color display elements of the color display section are equal in both the vertical and horizontal directions, and the pixels formed by the light-receiving elements of the color solid-state image sensor and the color display are equal. 2. A color television system according to claim 1, wherein said predetermined correspondence relationship is one-to-one with respect to pixels formed by color display elements of said parts.