KR20020044655A - Advanced color filter in video camera sensor - Google Patents

Abstract

PURPOSE: An advanced color filter of a video color camera sensor is provided to fabricate a band filter for transmitting light as dividing an S band and an L band of the first array, and to generate a color signal with 1 set for 2 pixels of an original color composed of a 2-band filter only, thereby reducing a defective proportion and improving resolution. CONSTITUTION: A prism(10) receives an incident light to separate the light into a light toward a straight drive and a light toward 90 degrees, and supplies the light of the straight drive to an S filter(20), then supplies the light of 90 degrees to an L filter(30). The S filter transmits the received light through an S band to supply the light to an optical sensor(40). The L filter transmits the received light through an L band to supply the light to an optical sensor(50). The optical sensor(40) supplies an S signal divided as a short wave band to a matrix(60). The optical sensor(50) supplies an L signal divided as a long wave band to the matrix. The matrix reproduces R, G, B colors by a variable value combination of a resistor and a transistor by receiving the S and the L signals, and outputs the R, G, B signals through signal output terminals(c, d, e).

Description

ADVANCED COLOR FILTER IN VIDEO CAMERA SENSOR}

TECHNICAL FIELD The present invention relates to an advanced color filter of a color camera sensor for video. In particular, the light transmission is performed by distinguishing the S-band and the L-band in the transmissive optical filter, thereby red, green, and blue. An advanced color filter that allows color reproduction.

Typically, the image sensor structure is composed of a color filter, an optical sensor and a storage area S1 as shown in FIG.

Here, the color filter is a filter attached to the surface of a charge coupled device (CCD) or CMOS (complementary metal-oxide semiconductor) image sensor in order to create a color in an image. The image you get from the CCD or CMOS image sensor is a black and white image with contrast only, so you need a color filter to create a color image. In addition, the optical sensor is a silicon (Si) optical cell device, the storage area means a memory.

That is, the color filter includes a primary color filter using red, green, and blue light, and cyan, magenta, yellow, and blue corresponding to each complementary color. There is a complementary color filter using (Green). Here, the primary color filter is not bright but is excellent in color reproducibility, so it is widely used in digital color cameras free of shutter speed, and the complementary color filter is used in video color cameras having limited shutter speed because of poor color reproducibility.

Complementary color filters used for dual video color cameras, ie cyan (hereinafter referred to as Cy), magenta (hereinafter referred to as Mg), yellow (hereinafter referred to as Ye), blue (hereinafter referred to as Ye) , Referred to as G), has a color filter arrangement configuration of complementary colors, as shown in FIG.

That is, by generating a color signal with one set of four pixels of one color composed of four color filters (G, Cy, Mg, Ye) (S2), a limited resolution is provided. Of the two-dimensional array of optical sensors composed of the optical cells shown in Fig. 3, four optical sensors S5 and the four-color filter S2 shown in Fig. 2 must be manufactured so that the manufacturing process is very difficult, and the relative position The combination is also not easy, there is a problem that the defect rate of the manufacturing process is high.

Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, the object of the band filter by manufacturing a band-pass filter for transmitting light while distinguishing the S-band and L-band of the one-dimensional array in the transmission type optical filter, The resolution can be reduced by reducing the defect rate of the manufacturing process and generating a color signal with one set of two pixels of one color consisting only of a two-band filter (S (short wavelength) or L (long wavelength)), and reducing the number of unit pixels. The present invention provides an advanced color filter of a color camera sensor for video that can be applied to a highly integrated color camera sensor.

In the present invention for achieving the above object, the advanced color filter of the color camera sensor for video is provided with a prism for receiving the incident light to be separated into a light directed in a straight direction, and a light directed in a direction of 90 °; An S filter for transmitting the light separated by the prism through an S band having a short wavelength; An L filter for transmitting the light provided from the prism through the L band having a long wavelength; An optical sensor for passing an S signal divided into short wave bands provided through an S filter and an L signal divided into long wave bands provided through an L filter; Receives S signal divided into short wave band and L signal divided into long wave band from optical sensor, and reproduces red, green, and blue colors by variable value combination of resistor and transistor. It characterized by including the matrix.

1 is a view schematically showing the structure of a conventional video camera image sensor,

2 is a view showing the configuration of the color filter arrangement of the complementary color in the conventional image sensor,

3 is a view showing an optical sensor showing a conventional optical cell shape,

4A is a view showing a transmission type optical filter showing the configuration of a band filter in the form of a long wave band (L) and a short wave band (S) according to the present invention,

4B is a view showing a transmission type optical filter showing the configuration of a band filter arrangement in the form of a short wave band (S) according to the present invention,

4C is a view showing a transmission type optical filter showing the configuration of a band filter in the form of a long wave band (L) according to the present invention,

5 is a diagram illustrating a circuit configuration of a camera to which a transmission type optical filter is applied according to the present invention.

6 is a view conceptually showing the characteristics of the transmissive optical filter according to the present invention,

7 is a diagram illustrating an application example in a 2CCD camera according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: prism 20: S filter

30: L filter 40, 50: light sensor

60: metrics

S1: Conventional Image Sensor Structure S2: Circle Color of Conventional 4 Pixel (G, Cy, Mg, Ye) Array

S3: Image transmissive optical filter consisting of S band and L band

S4: Image sensor structure of the present invention

S5: optical sensor consisting of optical cell

a: S signal input terminal b: L signal input terminal

c, d, e: Signal output terminal

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Referring to FIG. 4A, a transmission type optical filter showing a configuration of a band filter in the form of a long wave band (L) and a short wave band (S) according to the present invention is shown. It consists of a vertical arrangement or a horizontal arrangement. 4A shows a transmissive optical filter in a vertical arrangement.

That is, the long wave band L and the short wave band S are listed with a certain interval while having a one-dimensional array (vertical array or horizontal array). Among the all-transmissive optical filters, after transmitting the light while dividing the long wave band L and the short wave band S in the transmissive optical filter S3, the three primary colors are generated by the matrix 60 shown in FIG. 5. . By manufacturing such a filter, it is possible to solve a problem that has occurred conventionally, namely, an inconvenience of a manufacturing process in which four optical sensors S5 and four color filters S2 shown in FIG.

In the transmission type optical filter S3 shown in FIG. 4A, when the optical filter S3 is manufactured to have a one-dimensional array structure of a long wave band L and a short wave band S, a two-band filter S (short wavelength) or L (long wavelength) is used. By generating a color signal with one set of two pixels of the original color, the resolution can be improved over the existing four pixel one set four color filter.

In addition, as shown in FIG. 4B, a transmissive optical filter showing the configuration of a band filter arrangement in the form of a short wave band (S) is a short wave band (S) and a full pass (hereinafter referred to as F / P). The band consists of a vertical arrangement or a horizontal arrangement. 4B shows a transmissive optical filter in a vertical arrangement.

That is, the short wave bands S and the F / P bands are arranged with a certain interval while having a one-dimensional array (vertical array or horizontal array). After transmitting the light while dividing only the short wave band S of the dual transmissive optical filters, the three primary colors are generated by the matrix 60 illustrated in FIG. 5.

In addition, as shown in Figure 4c, a transmission type optical filter showing the configuration of a band filter array in the form of a long wave band (L), the long wave band (L) and the F / P band is composed of a vertical arrangement or a horizontal arrangement have. 4C shows a transmissive optical filter in a vertical arrangement.

That is, the long wave bands L and the F / P bands are arranged at regular intervals while having a one-dimensional array (vertical array or horizontal array). Among the all-transmissive optical filters, after transmitting light while distinguishing only the long-wave band L, three primary colors are generated by the matrix 60 illustrated in FIG. 5.

FIG. 5 is a diagram illustrating a circuit configuration of a color camera to which a transmissive optical filter is applied. The color image sensor includes a band filter and an optical sensor in which a long wave band L and a short wave band S are arranged vertically. (S4) and the matrix 60 are provided.

That is, the color image sensor S4 creates an L signal divided into long wave bands extracted through the L filter of the long wave band L, and provides the L signal to the matrix 60 through the L signal input terminal a. The S signal divided into short wave bands extracted through the S filter of the short wave band S is generated and provided to the matrix 60 through the S signal input terminal b.

The matrix 60 is a block including a plurality of resistors and transistors. The matrix 60 is provided with an L signal divided into a long wave band and an S signal divided into a short wave band, and is red (Red) by a variable value combination of a resistor and a transistor. Green and blue colors are reproduced and output through the signal output terminals c, d, and e.

6 is a view conceptually showing the characteristics of the transmissive optical filter according to the present invention, in which visible light having a wavelength of 400 nm to about 700 nm is used.

That is, the S signal that transmits light while dividing the S band in the short wavelength direction based on a 588 nm center (white) in visible light is provided to the matrix 60 through an optical sensor, and a 588 nm center ( The L signal, which transmits light while dividing the L band in the long wavelength direction, is provided to the matrix 60 through the optical sensor.

In more detail, the wavelength ranges from 435 nm to the blue band, 560 nm to the green band, and 635 nm to the red band within visible wavelengths of 400 nm to about 700 nm. The dual S band is a combination of a blue band and a green band, and the L band is a combination of a green band and a red band.

Therefore, when the S band in the short wavelength direction based on the center of 588 nm applied in the present invention and the L band in the long wavelength direction based on the center of 588 nm are applied, red and green ), And not only three colors of blue, but also four colors of green, cyan, magenta, and yellow.

7 is a diagram showing an application example of the 2CCD camera according to the present invention, which includes a prism 10, an S filter 20, an L filter 30, an optical sensor 40, 50, and a matrix. (60).

The prism 10 receives the incident light and separates the light toward the straight direction and the light toward the 90 ° direction, as shown in FIG. 7, and provides the S filter 20 with the light in the straight direction, 90 °. Direction light is provided to the L filter 30.

The S filter 20 transmits the light provided from the prism 10 through the S band, which is a short wavelength, and provides the light to the optical sensor 40. The L filter 30 transmits the light provided from the prism 10 to the L wavelength. Transmitting through the band is provided to the optical sensor 50.

The optical sensor 40 provides an S signal to the matrix 60, which is divided into short-wave bands provided from the prism 10 through the S filter 20, and the optical sensor 50 receives an L filter from the prism 10. The L signal divided into the long wave band provided through 30 is provided to the matrix 60.

The matrix 60 receives the S signal divided into the short wave bands from the optical sensor 40 and receives the L signal divided into the long wave bands from the optical sensor 50. ), And green and blue colors are reproduced and output through the signal output terminals c, d, and e.

Therefore, the band pass filter is manufactured by using an advanced image transmission optical filter including the S band and the L band of the one-dimensional array, thereby significantly reducing the increase in the defective rate of the conventional color filter manufacturing process, and the two band filter (S ( The resolution can be improved by generating a color signal with two pixels of one color consisting of short wavelength) or L (long wavelength)), and it can be applied to a miniaturized video color camera because the number of unit pixels can be reduced and integrated. It is.

Therefore, the present invention can significantly reduce the increase in defect rate of the existing color filter manufacturing process by applying the image transmission type optical filter manufactured by dividing the S-band and the L-band of the one-dimensional array to the color camera for video. In addition, the resolution can be improved by generating a color signal in one set of two pixels of one color consisting of a two-band filter (S (short wavelength) or L (long wavelength)), and finally, the number of unit pixels is reduced and the highly integrated color camera is reduced. There is an effect that can be applied to the sensor.

Claims (5)

In the color filter of the color camera sensor for video, A prism for receiving incident light and separating the light toward the straight direction and the light toward the 90 ° direction; A transmission type optical filter for transmitting the light separated by the prism through the S band having a short wavelength and the L band having a long wavelength; An optical sensor for passing an S signal divided into short wave bands provided through the transmissive optical filter and an L signal divided into long wave bands provided through the transmissive optical filter; The color signal of red, green, and blue is received from the optical sensor by receiving the S signal divided into the short wave band and the L signal divided into the long wave band by the variable value combination of the resistor and the transistor. An advanced color filter of a color camera sensor for video, comprising a matrix for playing back. The method of claim 1, wherein the transmissive optical filter, When manufactured to have a one-dimensional array structure and arranged at regular intervals in the vertical or horizontal state, the color camera sensor for video, characterized in that to generate a color signal of two pixels of one color consisting of a two-band filter one set Advanced color filter. The method of claim 1, wherein the transmissive optical filter, The light provided from the prism is transmitted through both short and long wave bands simultaneously, and the color of red, green, and blue colors is varied by the variable value combination of the transmitted short and long wave bands and the matrix. Advanced color filters of color camera sensors for video, characterized in that to play the. The method of claim 1, wherein the transmissive optical filter, The light provided from the prism is transmitted through the short wave band S, and the bands other than the short wave band S are full pass, and the variable value combination of the transmitted short wave band S and the matrix is performed. Advanced color filter for video color camera sensor, characterized in that to reproduce the colors of Red, Green, Blue. The method of claim 1, wherein the transmissive optical filter, The light provided from the prism transmits only the long wave band L, and a band other than the long wave band L is full pass, and the variable long combination of the long wave band L and the matrix is transmitted. Advanced color filter for video color camera sensor, characterized in that to reproduce the colors of Red, Green, Blue.