JP2012239104A - Solid imaging device, solid imaging device drive method and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a field effect transistor capable of miniaturizing a gate electrode without using global shutter structure in a solid imaging device.SOLUTION: A solid imaging device 1 includes: a color filter 114 having a first color filter element that transmits first incident light having brightness information and a second color filter element that transmits second incident light having brightness information and color information; a pixel array section 12 having plural first pixels each of which has a first photoelectric conversion section that converts the first incident light into a first signal charge and plural second pixels each of which has a second photoelectric conversion section that converts the second incident light into a second signal charge; a scanning section 18 that selects plural first pixels each of which reads a first signal charge in a first period and selects plural second pixels each of which reads a second signal charge in a second period; and an output circuit 17 that generates a pixel signal corresponding to the first or second signal charge read from the first or second pixels.

Description

  The present disclosure relates to a solid-state imaging device, a driving method of the solid-state imaging device, and an electronic apparatus.

A conventional CMOS image sensor accumulates signal charges by performing photoelectric conversion with a photodiode. The CMOS image sensor transfers the stored signal charge to a charge-voltage conversion amplifier called floating diffusion through a readout electrode.
The CMOS image sensor is a charge-voltage conversion amplifier, and outputs a video signal by outputting a voltage for each row or column of pixels arranged in a matrix using the amount of accumulated signal charge as a voltage.

For example, when a voltage is output for each row, the CMOS image sensor sequentially performs exposure (photoelectric conversion, charge accumulation) and signal output from the first row to the Nth row by shifting the timing one row at a time. The CMOS image sensor performs exposure and signal output of all pixels during one frame.
Thus, in the CMOS image sensor, since exposure and signal output are performed for each row or column, photoelectric conversion and charge accumulation are not performed at the same time in the entire imaging region. Therefore, in the CMOS image sensor, distortion of an image called a focal plane occurs.

As a method for solving this problem, a CMOS image sensor having a global shutter structure is known (see, for example, Patent Document 1).
Since the CMOS image sensor has a global shutter structure, photoelectric conversion and charge accumulation can be performed at the same time for all pixels in the imaging region, and a reduction in focal plane can be suppressed.

JP 2011-3737 A

  As disclosed in Patent Document 1, in order to realize the global shutter structure, it is necessary to provide an analog memory in the pixel, and there is a problem that the light receiving area of the pixel is reduced and the sensitivity is lowered.

Further, in order to temporarily accumulate signal charges even when no analog memory is provided, in the CMOS image sensor disclosed in Patent Document 1, an n-type semiconductor region is formed to extend to the back gate portion of the amplification transistor. Further, a p-type high concentration semiconductor region is formed between the channel region of the amplification transistor and the n-type semiconductor region.
As described above, in order to provide the global shutter structure in the CMOS image sensor, it is necessary to form an element or a semiconductor region different from the photoelectric conversion unit in the pixel.

  The present disclosure has been made in view of the above-described points, and provides a solid-state imaging device and a driving method for the solid-state imaging device that reduce distortion of an image due to a focal plane phenomenon without using a global shutter structure. .

  Moreover, this indication provides the electronic device provided with this solid-state imaging device.

  The solid-state imaging device according to the present disclosure includes a first color filter component that transmits first incident light having luminance information, and a second color filter component that transmits second incident light having luminance information and color information. A plurality of first pixels having a first photoelectric conversion unit for converting the first incident light into a first signal charge, and converting the second incident light into a second signal charge. Selecting a pixel array unit having a plurality of second pixels having a second photoelectric conversion unit to be converted, and the plurality of first pixels reading out the first signal charge in a first period; A scanning unit that selects the plurality of second pixels that read out the second signal charge in the second period, and the first signal read from the first pixel or the second pixel. A first pixel signal and a second pixel signal corresponding to the charge or the second signal charge And an output circuit for generating a prime signal.

  By separately reading the first signal charge accumulated in the first pixel 11 having luminance information and the second signal charge accumulated in the second pixel 11 having luminance information and color information, The distortion of the image due to the focal plane phenomenon can be reduced without using a shutter structure.

  The solid-state imaging device driving method according to the present disclosure includes a first color filter component that transmits first incident light having luminance information, and a second color that transmits second incident light having the luminance information and color information. A color filter having a filter component; a plurality of first pixels having a first photoelectric conversion unit that converts the first incident light into a first signal charge; and A pixel array unit having a plurality of second pixels each having a second photoelectric conversion unit that converts the signal charge into the signal charge; the first pixel that reads out the first signal charge or the second signal charge; or A scanning unit for selecting the second pixel, and an output for generating a pixel signal corresponding to the first signal charge or the second signal charge read from the first pixel or the second pixel A solid-state imaging device comprising a circuit, The scanning unit selects the plurality of first pixels that read out the first signal charge in a first period; and the signal processing unit selects the first pixel in the first period. Generating a first pixel signal corresponding to the first signal charge read from the first signal charge, and the scanning unit reads the second signal charge in a second period. And a step of generating a second pixel signal corresponding to the first signal charge read from the second pixel in the second period by the signal processing unit. Prepare.

  An electronic apparatus according to the present disclosure includes the above-described solid-state imaging device and an optical lens.

  According to the present disclosure, it is possible to reduce image distortion due to a focal plane phenomenon without using a global shutter structure.

The figure which shows the solid-state imaging device which concerns on 1st Embodiment. FIG. 3 is a diagram illustrating a color filter according to the first embodiment. FIG. 3 is a diagram illustrating a method for driving the solid-state imaging device according to the first embodiment. The figure which shows the solid-state imaging device which concerns on 2nd Embodiment. The figure which shows the color filter which concerns on 2nd Embodiment. The figure which shows the solid-state imaging device which concerns on 3rd Embodiment. The figure which shows the color filter which concerns on 3rd Embodiment. The figure which shows the color filter which concerns on 4th Embodiment. FIG. 10 is a diagram showing an electronic apparatus according to a fifth embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a solid-state imaging device 1 according to the first embodiment. The solid-state imaging device 1 includes a sensor unit 10 and a signal processing unit 20.

The sensor unit 10 includes a pixel array unit 12 in which a plurality of pixels 11 are arranged in a matrix, a vertical signal line 13, a vertical selection circuit 14, a horizontal selection circuit 15, a scanning control unit 16, and an output circuit 17. I have. The vertical selection circuit 14 and the horizontal selection circuit 15 are collectively referred to as a scanning unit 18.
The signal processing unit 20 includes a memory 21 and a signal processing circuit 22.

The pixel array unit 12 has a plurality of pixels 11 arranged on a semiconductor substrate in a matrix.
Although not shown, the pixel 11 includes a photoelectric conversion element (for example, a photodiode), a transfer transistor, a reset transistor, and an amplification transistor. The transfer transistor transfers the signal charge obtained by the photoelectric conversion element to an FD (floating diffusion) part. The reset transistor resets the potential of the FD portion. The amplification transistor outputs a pixel signal corresponding to the potential of the FD portion. The operation of each of these transistors is controlled by a signal supplied from the scanning unit 18 via the horizontal signal line 19 and the vertical signal line 13. Note that the pixel 11 may have a configuration using four transistors provided with a selection transistor for performing pixel selection in addition to the configuration using the three transistors described above.

  The vertical signal line 13 is a wiring that sends the pixel signal captured by each pixel 11 to the horizontal selection circuit 15. The vertical signal line 13 is wired along the vertical direction of the arrangement of the pixels 11. The vertical selection circuit 14 selects the pixels 11 in units of rows based on the control signal and the vertical synchronization signal, and sequentially scans along the vertical direction.

  The horizontal selection circuit 15 selects the pixels 11 in units of columns based on the control signal and the horizontal synchronization signal, and sequentially scans along the horizontal direction. The horizontal selection circuit 15 sequentially selects the pixels 11 along the horizontal direction in synchronization with scanning by the vertical selection circuit 14. Pixel signals accumulated in the pixels 11 are sequentially sent to the horizontal selection circuit 15 via the vertical signal lines 13. The horizontal selection circuit 15 sends the pixel signals sent sequentially to the output circuit 17.

  The scanning control unit 16 generates a vertical synchronization signal and a horizontal synchronization signal based on a clock input from the outside or a clock generated by itself, and supplies the vertical synchronization signal and the horizontal synchronization signal to the vertical selection circuit 14 and the horizontal selection circuit 15, respectively.

  The scanning control unit 16 generates a control signal that designates the pixels 11 that are sequentially scanned by the vertical selection circuit 14 and the horizontal selection circuit 15, and supplies the control signal to the vertical selection circuit 14 and the horizontal selection circuit 15. Specifically, the position information of each pixel 11 is stored in the scanning control unit 16 as the address of each pixel 11. The scan control unit 16 controls the pixels 11 scanned by the vertical selection circuit 14 and the horizontal selection circuit 15 by generating a control signal including address information.

  The scanning control unit 16 generates a vertical synchronization signal, a horizontal synchronization signal, and a control signal so as to read out pixel signals of all the pixels 11 during one frame.

  The output circuit 17 performs various signal processing on the pixel signals sequentially sent from the horizontal selection circuit 15, generates pixel data, and outputs the pixel data to the signal processing unit 20.

  Pixel data output from the output circuit 17 is stored in the memory 21 of the signal processing unit 20. The signal processing circuit 22 reads out the pixel data for one frame from the memory 21 and performs various signal processing to generate image data. The signal processing circuit 22 outputs the generated image data to a subsequent circuit (not shown).

  The color filter 114 is formed in a matrix corresponding to each pixel 11. FIG. 2 is a diagram illustrating an arrangement example of the color filter 114 according to the present embodiment.

  The color filter 114 includes a first color filter component that transmits first incident light having luminance information corresponding to each pixel 11, and a second color filter component that transmits second incident light having luminance information and color information. And have. For example, the first color filter component is the white filter component W, and the second color filter component is the red filter component R, the green filter component G, and the blue filter component B.

  As shown in FIG. 2, in the color filter 114, a plurality of first color filter components arranged in a row in the horizontal direction and a plurality of second color filter components arranged in a row in the horizontal direction are alternately arranged in the vertical direction. A plurality are arranged.

  The vertical address (V address) of each pixel 11 is set to “1, 2,..., N” (N ≧ 2) in order from the bottom of FIG. At this time, the color filter component of the color filter corresponding to the pixel 11 having an odd vertical address (hereinafter also referred to as an odd V address) is the second color filter component. That is, the red filter component R, the green filter component G, and the blue filter component B, which are the second color filter components, are arranged so as to correspond to the pixels 11 with odd V addresses.

  In FIG. 2, the second color filter component includes a plurality of rows in which red filter components R and green filter components G are alternately arranged and rows in which green filter components G and blue filter components B are alternately arranged. It is an arranged configuration. That is, the green filter component G is checkered at odd-numbered V addresses. The blue filter component B and the red filter component R are arranged between the green filter components G arranged in a checkered pattern.

  The color filter component of the color filter corresponding to the pixel 11 whose vertical address is an even number (hereinafter also referred to as an even V address) is the first color filter component. That is, the white filter component W, which is the first color filter component, is arranged so as to correspond to the even-numbered V address pixels 11.

  Here, the pixel 11 corresponding to the first color filter component is defined as the first pixel 11-1. The first pixel 11-1 includes a first photoelectric conversion unit that converts the first incident light transmitted through the first color filter component into a first signal charge.

  Let the pixel 11 corresponding to the second color filter component be the second pixel 11-2. The second pixel 11-2 includes a second photoelectric conversion unit that converts the second incident light transmitted through the second color filter component into a second signal charge.

  That is, the pixel array unit 12 includes a plurality of first pixels 11-1 arranged in a line in the horizontal direction and a plurality of second pixels 11-2 arranged in a line in the horizontal direction, alternately in the vertical direction. A plurality of matrix shapes.

Subsequently, a driving method of the solid-state imaging device 1 will be described.
The scanning unit 18 of the solid-state imaging device 1 selects the first pixel 11-1 that accumulates the first incident light having luminance information in the first period as the first signal charge, and uses the first signal charge as the first signal charge. Read out as the first pixel signal. The scanning unit 18 selects the second pixel 11-2 that accumulates the second incident light having the luminance information and the color information in the second period as the second signal charge, and uses the second signal charge as the second signal charge. Is read out as a pixel signal. As described above, the solid-state imaging device 1 according to the present embodiment separately reads the first signal charge having luminance information and the second signal charge having luminance information and color information.

  Details of the driving method of the solid-state imaging device 1 will be described with reference to FIG. FIG. 3 is a diagram illustrating a timing chart of the shutter operation and the readout operation in the pixel readout according to the present embodiment.

  The vertical synchronizing signal in FIG. 3 is a signal that is at a high level for a predetermined period at the start of one frame. Therefore, the period from when the vertical synchronization signal once becomes High level to the next High level is the time for reading out all the pixels 11.

  The horizontal synchronization signal is a signal that becomes High level for a predetermined time at the beginning of each row. Accordingly, the period from when the horizontal synchronization signal once becomes High level to the next High level corresponds to the time for reading out the pixels 11 in one row (one horizontal time).

  In the present embodiment, in order to ensure the maximum exposure period, after performing the shutter operation, the read operation is performed immediately before the next shutter operation. Therefore, the shutter operation and the readout operation are performed once in each row during one frame. The exposure period is a period from when the shutter operation is performed until the next reading operation is performed. Actually, there is a case where the shutter operation is performed in addition to the shutter operation for determining the actual exposure period for the countermeasure against blooming. However, in this embodiment, such a shutter operation is not considered.

  First, the readout operation of the pixels 11 in the first row is performed at the beginning of one frame. The pixels 11 in the first row are the second pixels 11-2 that store the second incident light corresponding to the red filter component or the green filter component and having luminance information and color information. The reading operation is performed by the scanning control unit 16 generating a control signal designating a vertical address corresponding to the first row and passing it to the vertical selection circuit 14.

  When the pixel 11 in the first row is selected by the vertical selection circuit 14, the exposure ends and the signal charge accumulated in the previous frame is output as a pixel signal. That is, a read operation is performed on the pixels 11 in the first row.

  In FIG. 3, after two horizontal times, the pixels 11 in the first row reset the accumulated signal charges and start exposure. That is, the shutter operation is performed on the pixels 11 in the first row.

  The solid-state imaging device 1 performs the readout operation of the pixels 11 in the third row one horizontal time after the readout operation of the pixels 11 in the first row. As shown in FIG. 2, the pixels 11 in the third row are second pixels 11-2 that store the second incident light corresponding to the green filter component or the blue filter component and having luminance information and color information. is there. The reading operation and the shutter operation are the same as those of the pixels 11 in the first row.

  As described above, the solid-state imaging device 1 reads and shutters the pixels 11 with odd V addresses in the order of the first row, the third row, the fifth row,..., The N−1th row (N is an even number). An operation is performed to read out a pixel signal having luminance information and color information. Since the odd-numbered V-address pixels 11 are half of all the pixels 11 in this embodiment, the solid-state imaging device 1 reads out all pixel signals having luminance information and color information in a ½ frame period. The time for which the solid-state imaging device 1 reads the pixel signal having the luminance information and the color information is referred to as a color information reading period.

  When the solid-state imaging device 1 reads out a pixel signal having luminance information and color information, it next reads out a pixel signal having luminance information. First, the solid-state imaging device 1 performs a reading operation of the pixels 11 in the second row. The pixels 11 in the second row are first pixels 11-1 that store the first incident light corresponding to the white filter component and having luminance information. The reading operation is performed by the scanning control unit 16 generating a control signal designating a vertical address corresponding to the second row and passing it to the vertical selection circuit 14.

  When the pixel 11 in the second row is selected by the vertical selection circuit 14, the exposure ends and the signal charge accumulated in the previous frame is output as a pixel signal. That is, a read operation is performed on the pixels 11 in the second row.

  In FIG. 3, after two horizontal times, the pixels 11 in the second row reset the accumulated signal charges and start exposure. That is, the shutter operation is performed on the pixels 11 in the second row.

  The solid-state imaging device 1 performs the readout operation of the pixels 11 in the fourth row one horizontal time after the readout operation of the pixels 11 in the second row. As shown in FIG. 2, the pixels 11 in the fourth row correspond to the white filter components in the same manner as the pixels 11 in the second row, and the first pixels 11 − that store the first incident light having luminance information. 1. The reading operation and the shutter operation are the same as those of the pixels 11 in the second row.

  As described above, the solid-state imaging device 1 performs the readout and shutter operation of the pixels 11 with the even V addresses in the order of the second row, the fourth row, the sixth row,. Read out pixel signals. Since the pixels 11 with even V addresses are half of all the pixels 11, the solid-state imaging device 1 reads out all pixel signals having luminance information in a ½ frame period. The time for the solid-state imaging device 1 to read out a pixel signal having luminance information is referred to as a luminance information reading period.

  The solid-state imaging device 1 reads out a pixel signal having luminance information and color information in a color information reading period corresponding to 1/2 frame, and reads out a pixel signal having luminance information in a luminance information reading period corresponding to 1/2 frame. Thus, all pixel signals are read out in one frame.

  The read pixel signal is subjected to signal processing by the output circuit 17, converted into pixel data, and stored in the memory 21 of the signal processing unit 20. When the pixel data is stored in the memory 21 in the order in which the output circuit 17 outputs, the pixel data corresponding to the odd-numbered V address is first stored in the memory 21, and then the pixel data corresponding to the even-numbered V address is stored. In this case, the signal processing circuit 22 rearranges the pixel data stored in the memory 21 along the V address, and then performs signal processing to generate one frame of image data.

  As described above, the solid-state imaging device 1 according to the first embodiment reads the first signal charge having luminance information and the second signal charge having luminance information and color information separately.

  In the present embodiment, one frame period necessary for reading all pixels is divided into two equal parts, a luminance information reading period (first period) and a color information reading period (second period). The scanning control unit 16 determines a line to be selected by the scanning unit 18 so that all the first signal charges are read out and all the second signal charges are read out during the color information reading period.

  When all signal charges are read in the order of V addresses, the time for reading the first signal charge having luminance information (luminance information reading period) and the time for reading the second signal charge having luminance information and color information (color information reading period) ) Both are one frame.

  On the other hand, the solid-state imaging device 1 according to the present embodiment has a time for reading the first signal charge having luminance information (luminance information reading period) and a time for reading the second signal charge having luminance information and color information (color). (Information reading period) is ½ frame, and the reading period is ½ compared to the case where all signal charges are read in the order of V addresses.

  The solid-state imaging device 1 can reduce the readout period to ½ of the conventional one by simply changing the readout order, and can reduce image distortion due to the focal plane phenomenon without using a global shutter structure.

  When half of the pixel signals are read out, a time shift of 1/2 frame occurs between the half of the pixel signals read out earlier and the half of the pixel signals read out later. In the solid-state imaging device 1 of the present embodiment, the pixel to be read out is divided into a pixel signal having luminance information and a pixel signal having luminance information and color information, thereby minimizing image distortion due to temporal shift. Can do.

  In this embodiment, reading is performed from the second signal charge having luminance information and color information corresponding to the odd-numbered V address. However, reading is performed from the first signal charge having luminance information corresponding to the even-numbered V address. Good. The arrangement of the color filter 114 is also an example, and the first color filter component that transmits the first incident light having luminance information is arranged corresponding to the odd-numbered V address, and the second color filter having the luminance information and the color information is provided. The second color filter component that transmits incident light may be arranged at even V addresses.

(Second Embodiment)
A solid-state imaging device 2 according to the second embodiment will be described. FIG. 4 is a diagram illustrating the solid-state imaging device 2 according to the present embodiment. The solid-state imaging device 2 is different from the solid-state imaging device 1 of FIG. 1 in that the pixels 11 are selected in units of columns and sequentially scanned along the horizontal direction. The same components as those in the solid-state imaging device 1 shown in FIG.

  The horizontal signal line 29 is a wiring that sends the pixel signal captured by each pixel 11 to the vertical selection circuit 24. The horizontal signal line 29 is wired along the horizontal direction of the arrangement of the pixels 11. The horizontal selection circuit 25 selects the pixels 11 in units of columns based on the control signal and the horizontal synchronization signal, and sequentially scans along the horizontal direction.

  The vertical selection circuit 24 selects the pixels 11 in units of rows based on the control signal and the vertical synchronization signal, and sequentially scans along the vertical direction. The vertical selection circuit 24 sequentially selects the pixels 11 along the vertical direction in synchronization with scanning by the horizontal selection circuit 25. Pixel signals accumulated in the pixels 11 are sequentially sent to the vertical selection circuit 24 via the vertical signal lines 23. The vertical selection circuit 24 sends the sequentially sent pixel signals to the output circuit 17.

  The scanning control unit 26 generates a control signal that designates the pixels 11 that the vertical selection circuit 24 and the horizontal selection circuit 25 sequentially scan, and supplies the control signal to the vertical selection circuit 24 and the horizontal selection circuit 25. Specifically, the position information of each pixel 11 is stored in the scanning control unit 26 as the address of each pixel 11. The scanning control unit 26 controls the pixels 11 scanned by the vertical selection circuit 24 and the horizontal selection circuit 25 by generating a control signal including address information.

The color filter 214 is formed in a matrix corresponding to each pixel 11. FIG. 5 is a diagram illustrating an arrangement example of the color filter 214 according to the present embodiment.
As shown in FIG. 5, in the color filter 214, a plurality of first color filter components arranged in a line in the vertical direction and a plurality of second color filter components arranged in a line in the vertical direction are alternately arranged in the horizontal direction. A plurality are arranged.

  The horizontal address (H address) of each pixel 11 is set to “1, 2,..., N” (N ≧ 2) in order from the left of FIG. At this time, the color filter component of the color filter corresponding to the pixel 11 having an odd horizontal address (hereinafter also referred to as an odd H address) is the second color filter component. That is, the red filter component R, the green filter component G, and the blue filter component B, which are the second color filter components, are arranged so as to correspond to the pixels 11 with odd V addresses.

  The color filter component of the color filter corresponding to the pixel 11 whose horizontal address is an even number (hereinafter also referred to as an even H address) is the first color filter component. That is, the white filter component W, which is the first color filter component, is arranged so as to correspond to the pixels 11 with even H addresses.

  Next, a method for driving the solid-state imaging device 2 will be described. The driving method of the solid-state imaging device 2 is the same as the case of replacing the vertical synchronization signal in FIG. 3 with the horizontal synchronization signal, the horizontal synchronization signal with the vertical synchronization signal, and the V address with the H address.

  That is, the horizontal synchronization signal generated by the scanning control unit 26 in the present embodiment is a signal that is at a high level for a predetermined period at the start of one frame. Accordingly, the period from when the horizontal synchronizing signal once becomes High level to when it becomes High level next time becomes the time when the reading processing of all the pixels 11 is performed.

  The vertical synchronization signal generated by the scanning control unit 26 of the present embodiment is a signal that becomes a high level for a predetermined time at the beginning of each column. Therefore, the period from when the vertical synchronizing signal once becomes High level to the next High level corresponds to the time for reading out the pixels 11 in one column (one vertical time).

  First, the solid-state imaging device 2 reads and shutters the odd-numbered H address pixels 11 in the order of the first column, the third column, the fifth column,..., The N−1th column (N is an even number). To read out pixel signals having luminance information and color information. Since the odd-numbered H-address pixels 11 are half of all the pixels 11, the solid-state imaging device 2 reads all pixel signals having luminance information and color information in a ½ frame period.

  The solid-state imaging device 2 reads and shutters the pixels 11 with even H addresses in the order of the second column, the fourth column, the sixth column,..., The Nth column, and a pixel signal having luminance information. Is read. Since the pixels 11 with even H addresses are half of all the pixels 11, the solid-state imaging device 2 reads out all pixel signals having luminance information in a ½ frame period.

  Even when the pixels 11 are selected in units of columns and sequentially scanned along the horizontal direction as in the solid-state imaging device 2 of the present embodiment, the first accumulated in the first pixels 11 having luminance information. The signal shutter and the second signal charge accumulated in the second pixel 11 having luminance information and color information are read out separately, thereby providing a global shutter structure as in the solid-state imaging device 1 of the first embodiment. The distortion of the image due to the focal plane phenomenon can be reduced without using.

  In this embodiment, reading is performed from the second signal charge having luminance information and color information corresponding to the odd-numbered H address, but reading is performed from the first signal charge having luminance information corresponding to the even-numbered H address. Good. The arrangement of the color filter 214 is also an example, and the first color filter component that transmits the first incident light having luminance information is arranged corresponding to the odd-numbered H addresses, and the second color information having luminance information and color information is provided. The second color filter component that transmits incident light may be arranged at even H addresses.

(Third embodiment)
A solid-state imaging device 3 according to the third embodiment will be described. The solid-state imaging device 3 according to the present embodiment illustrated in FIG. 6 has the same configuration as the solid-state imaging device 1 illustrated in FIG. 1 except for the color filter 314 and the scanning control unit 36.

  The color filter 314 shown in FIG. 7 includes a row in which the white filter component W and the blue filter component B are alternately arranged in a column and a row in which the red filter component and the green filter component G are alternately arranged in a column. , And a plurality of elements arranged alternately in the vertical direction.

  In the present embodiment, the first color filter component that transmits the first incident light having luminance information is a white filter component W and a green filter component G. The second color filter component that transmits the second incident light having luminance information and color information is a red filter component R and a blue filter component B. The incident light transmitted through the green filter component G includes color information, but also includes a lot of luminance information. Therefore, in this modification, the green filter component G is also the first color filter component.

  The scanning unit 18 of the solid-state imaging device 3 first selects the second pixel 11-2 that accumulates second incident light having luminance information and color information as a signal charge. That is, the solid-state imaging device 3 reads out all signal charges of the second pixels 11-2 corresponding to the red filter component R and the blue filter component B.

  Next, the scanning unit 18 of the solid-state imaging device 3 selects the first pixel 11-1 having luminance information. That is, the solid-state imaging device 3 reads all the signal charges of the first pixel 11-1 corresponding to the white filter component W and the green filter component.

  The scanning control unit 36 generates the same vertical synchronizing signal and horizontal synchronizing signal as in FIG. The scan control unit 16 of the first embodiment generates a control signal that designates the V address in synchronization with the horizontal synchronization signal. In the color filter 314 of the embodiment, since the first color filter component and the second color filter component are arranged in a checkered pattern, the scan control unit 36 performs control to specify the V address and the H address in synchronization with the horizontal synchronization signal. Generate a signal.

  Hereinafter, the address designated by the scanning control unit 36 will be specifically described. The V address and H address designated by the scanning control unit 36 are expressed as (V, H). For example, when the scanning control unit 36 selects the pixels in the first row and the first column, the V address and the H address designated by the scanning control unit are expressed as (1, 1).

  The scanning control unit 36 first specifies the pixels 11 in the odd-numbered columns in the first row and the pixels 11 in the even-numbered columns in the second row. The addresses designated by the scanning control unit 36 are “(1, 1), (1, 3),..., (1, N−1)” and “(2, 2), (2, 4),. .., (2, N) ". As a result, the solid-state imaging device 3 reads the signal charge of the second pixel corresponding to the second color filter component indicated by the hatching in FIG.

  The scan control unit 36 designates the pixels 11 in the odd-numbered columns in the third row and the pixels 11 in the even-numbered columns in the fourth row. The addresses designated by the scanning control unit 36 are “(3, 1), (3, 3),..., (3, N−1)” and “(4, 2), (4, 4),. .., (4, N) ". Thereby, the solid-state imaging device 3 reads N signal charges of the second pixels corresponding to the second color filter components in the third and fourth rows.

  The scanning control unit 36 specifies the addresses of the N second pixels 11 in ascending order of the V address. By repeating this N / 2 times, the solid-state imaging device 3 reads out all the second signal charges having luminance information and color information accumulated in the second pixel 11 in a 1/2 frame period.

  Next, the solid-state imaging device 3 reads all the first signal charges having luminance information accumulated in the first pixels 11 in a 1/2 frame period.

  Specifically, the scanning control unit 36 designates the pixels 11 in the even-numbered columns in the first row and the pixels 11 in the odd-numbered columns in the second row. The addresses designated by the scanning control unit 36 are “(1,2), (1,4),..., (1, N)” and “(2,1), (2,3),. , (2, N−1) ”. As a result, the solid-state imaging device 3 reads N signal charges of the first pixels corresponding to the first color filter components in the first and second rows.

  The scanning control unit 36 specifies the addresses of the N first pixels 11 in ascending order of the V address. By repeating this N / 2 times, the solid-state imaging device 3 reads all the first signal charges having luminance information and color information accumulated in the first pixel 11 in a 1/2 frame period.

  As described above, even when the scanning control unit 36 designates both the V address and the H address as in the solid-state imaging device 3 of the present modification, the first signal charge having the luminance information, the luminance information, and the color information By separately reading out the second signal charge having, the image distortion due to the focal plane phenomenon can be reduced without using the global shutter structure as in the solid-state imaging device 1 of the first embodiment.

  In addition, as in the solid-state imaging device 3, when the scanning control unit 36 designates both the V address and the H address, the first color filter component and the second color filter component may not be arranged in a line. Since the first signal charge having luminance information and the second signal charge having luminance information and color information can be read out separately, the degree of freedom of arrangement of each color filter component can be increased. Furthermore, by using the green filter component G as the first color filter component, the number of white filter components W can be reduced and the number of other color filter components can be increased as compared with the color filter 114 of the first embodiment. it can. Thus, by using the green filter component G as the first color filter component, the degree of freedom of the ratio of each color filter component can be increased.

(Fourth embodiment)
A solid-state imaging device 4 according to the fourth embodiment will be described. Since the solid-state imaging device 4 according to the present embodiment has the same configuration as the solid-state imaging device 1 shown in FIG. 1 except for the color filter 414, the solid-state imaging device 4 except for the color filter 414 will be described with reference to FIG. To do.

  The color filter 414 shown in FIG. 8 has a plurality of first color filter components arranged in a line in the horizontal direction and a plurality of second color filter components arranged in a line in the horizontal direction alternately arranged in the vertical direction. Is done.

  In the present modification, the first color filter component is the white filter component W, and the second color filter component is the red filter component R, the green filter component G, and the blue filter component B.

  The color filter 414 has an oblique grid arrangement in which the center of the color filter component of the next row is shifted by the amount of the ½ filter component in the row direction and the column direction with respect to the center of the color filter component of a certain row.

Therefore, the pixels 11 arranged corresponding to each color filter component of the color filter 414 are also arranged in an oblique grid like the color filter 414 in FIG. That is, the pixel array unit 12 is arranged in a matrix and has a diagonal lattice pixel arrangement in which the pixel center of the next row is shifted by 1/2 pixel in both directions and the column direction with respect to the pixel center of a row. Have.
The driving method of the solid-state imaging device 4 is the same as that in FIG.

As in the solid-state imaging device 4, even if the color filters and pixels are arranged in an oblique grid pattern, the global shutter structure is not used as in the solid-state imaging device 1 of the first embodiment, and the image is distorted due to the focal plane phenomenon. Can be reduced.
Note that the color filters and pixels of the solid-state imaging devices 2 and 3 of the second and third embodiments may be arranged in an oblique grid pattern.

(Fifth embodiment)
Next, in the fifth embodiment, an application example of the solid-state imaging device 1 will be described. FIG. 9 shows an example in which the solid-state imaging device 1 is applied to an electronic device 400. Examples of the electronic device 400 include a digital camera, a camera such as a mobile phone, a scanner, a monitoring camera, and the like. Here, a case where the electronic device 400 is a digital camera will be described.

  The electronic apparatus 400 according to the present embodiment includes the solid-state imaging device 1, an optical lens 210, and a drive circuit 212.

The optical lens 210 forms image light (incident light) from the subject on the imaging surface of the solid-state imaging device 1. As a result, signal charges are accumulated in the solid-state imaging device 1 for a certain period.
The drive circuit 212 supplies a drive signal that controls the transfer operation of the solid-state imaging device 1.

  The solid-state imaging device 1 performs various types of signal processing on the signal charge accumulated in the photoelectric conversion element based on the drive signal. The solid-state imaging device 1 outputs image data, which is a generated imaging signal, to a storage medium such as a memory (not shown), a monitor, or the like.

  As described above, since the electronic apparatus 400 according to this embodiment includes the solid-state imaging device 1 according to the first embodiment, image distortion due to the focal plane phenomenon is reduced without using the global shutter structure. be able to.

  Here, although the example which mounts the solid-state imaging device 1 which concerns on 1st Embodiment in the electronic device 400 was shown, even if it mounts the solid-state imaging devices 2-4 which concern on the 2nd-4th embodiment in the electronic device 400. Good.

  Finally, the description of each embodiment described above is an example of the present disclosure, and the present disclosure is not limited to the above-described embodiment. For this reason, it is a matter of course that various modifications can be made in accordance with the design and the like as long as they do not depart from the technical idea according to the present disclosure other than the embodiments described above.

DESCRIPTION OF SYMBOLS 10 Sensor part 11 Pixel 12 Pixel array part 13, 23 Vertical signal line 14, 24 Vertical selection circuit 15, 25 Horizontal selection circuit 16, 26, 36 Scan control part 17 Output circuit 18 Scan part 19, 29 Horizontal signal line 20 Signal processing Unit 21 Memory 22 Signal processing circuit 214, 314, 414 Color filter

Claims (7)

A color filter having a first color filter component that transmits first incident light having luminance information, and a second color filter component that transmits second incident light having luminance information and color information;
A plurality of first pixels having a first photoelectric conversion unit that converts the first incident light into a first signal charge, and a second photoelectric that converts the second incident light into a second signal charge. A pixel array unit having a plurality of second pixels having a conversion unit;
The plurality of first pixels that read out the first signal charges are selected in a first period, and the plurality of second pixels that read out the second signal charges are selected in a second period. A scanning unit,
An output circuit for generating a first pixel signal and a second pixel signal corresponding to the first signal charge or the second signal charge read from the first pixel or the second pixel;
A solid-state imaging device. The color filter is
A plurality of the first color filter components arranged in a line in the horizontal direction;
2. The solid-state imaging device according to claim 1, having a matrix shape in which a plurality of the second color filter components arranged in a line in the horizontal direction are alternately arranged in the vertical direction.   The first and second color filter components of the color filter are arranged in a matrix, and the center of the color filter component of the next row is in the row direction and the column direction with respect to the center of the color filter component of a certain row. The solid-state imaging device according to claim 1, wherein the solid-state imaging device has an array of diagonal lattices shifted by a half.   One frame necessary for reading all the pixels included in the pixel array portion is divided into two equal parts in the first period and the second period, and all the first signal charges are read in the first period. 4. The solid state according to claim 1, further comprising: a scanning control unit that determines a line to be selected by the scanning unit so as to read all the second signal charges in the second period. Imaging device. The first color filter component is a white filter component;
5. The solid-state imaging device according to claim 1, wherein the second color filter component includes a red filter component, a green filter component, and a blue filter component. A color filter having a first color filter component that transmits first incident light having luminance information and a second color filter component that transmits second incident light having luminance information and color information; and A plurality of first pixels each having a first photoelectric conversion unit that converts the incident light into a first signal charge; and a second photoelectric conversion unit that converts the second incident light into a second signal charge. A pixel array unit having a plurality of second pixels, a scanning unit for selecting the first pixel or the second pixel for reading out the first signal charge or the second signal charge, An output circuit that generates a pixel signal corresponding to the first signal charge or the second signal charge read from the first pixel or the second pixel; There,
The scanning unit selecting the plurality of first pixels that read the first signal charge in a first period;
The signal processing unit generating a first pixel signal corresponding to the first signal charge read from the first pixel in the first period;
The scanning unit selecting the plurality of first pixels that read out the second signal charge in a second period;
Generating a second pixel signal corresponding to the first signal charge read from the second pixel in the second period by the signal processing unit;
A method for driving a solid-state imaging device. A color filter having a first color filter component that transmits first incident light having luminance information, and a second color filter component that transmits second incident light having luminance information and color information;
A plurality of first pixels having a first photoelectric conversion unit that converts the first incident light into a first signal charge, and a second photoelectric that converts the second incident light into a second signal charge. A pixel array unit having a plurality of second pixels having a conversion unit;
The plurality of first pixels that read out the first signal charges are selected in a first period, and the plurality of second pixels that read out the second signal charges are selected in a second period. A scanning unit,
An output circuit for generating a first pixel signal and a second pixel signal corresponding to the first signal charge or the second signal charge read from the first pixel or the second pixel;
A signal processing circuit for processing the electrical signal;
A solid-state imaging device comprising:
An optical lens for guiding the incident light to the photoelectric conversion unit;
Electronic equipment comprising.

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