Shared pixel structure applied to automatic focusing and image sensing device
A technology of sharing pixels and auto-focus, which is applied in the field of image sensors, can solve the problem of low full-well capacity of pixel units, and achieve the effect of increasing the area and increasing the full-well capacity
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no. 1 example
[0032] Please refer to Figure 1 to Figure 3 , figure 1 A schematic structural diagram of the shared pixel structure provided by the first embodiment of the present invention is shown, figure 2 shows along figure 1 Section II-II schematic diagram, image 3 shows along figure 1 Schematic cross-section of III-III. The shared pixel structure of this embodiment includes a first photodiode PD1, a second photodiode PD2, a first transfer transistor TX1, a second transfer transistor TX2, a floating diffusion FD, a reset transistor RST, a source follower transistor SF, and a selection transistor RS , the first photodiode PD1 and the first transfer transistor TX1 constitute the first photosensitive unit, the second photodiode PD2 and the second transfer transistor TX2 constitute the second photosensitive unit, and the first photosensitive unit and the second photosensitive unit share the floating diffusion point FD, Reset transistor RST, source follower transistor SF and select tr...
no. 2 example
[0046] The present invention also provides another embodiment of the shared pixel structure, such as Figure 5 and Image 6 As shown, the shared pixel structure of this embodiment includes four first photosensitive units and four second photosensitive units, and the first photosensitive units and the four second photosensitive units share the same reset transistor RST and the same source follower transistor SF and the same select transistor RS.
[0047] Specifically, four first photosensitive units and four second photosensitive units are arranged in a 2*2 manner. Specifically, the first transmission transistor TX1 and the second transmission transistor TX2 in the first row are disposed adjacent to the first transmission transistor TX1 and the second transmission transistor TX2 in the second row. Such an arrangement centrally arranges the first transmission transistor TX1 and the second transmission transistor TX2, so that the first photodiode PD1 and the second photodiode P...
no. 3 example
[0049] The present invention also provides a shared pixel structure of another embodiment, such as Figure 7 As shown, the shared pixel structure of this embodiment includes four first photosensitive units and four second photosensitive units, and the first photosensitive units and the four second photosensitive units share the same reset transistor RST and the same source follower transistor SF and the same select transistor RS.
[0050] Specifically, four first photosensitive units and four second photosensitive units are arranged in a 1*4 manner. Specifically, the first transmission transistor TX1 and the second transmission transistor TX2 in the first row are arranged adjacent to the first transmission transistor TX1 and the second transmission transistor TX2 in the second row, and the first transmission transistor TX1 and the second transmission transistor in the third row are arranged adjacent to each other. The transfer transistor TX2 is disposed adjacent to the first ...
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